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6G Celicas Forums > 6th Generation Celica > Engine/Transmission/Maintenance
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GotToyota
Since there is an exhaust thread pretty much every other day, I thought it would be good to make one for those looking to make their own custom exhaust. Many people tend to go this way because the aftermarket systems for our cars are becoming more and more difficult to find. Let's begin?

What size piping would be best for my GT/ST//GT4/etc?
This question really depends on your goals for the car, and what you do with it. My typical rule of thumb that has worked best for me, is 2.5" and below for N/A vehicles, and 3"-3.5" for turbo'd vehicles. The bigger the piping on an N/A, the more bottom end you will lose, however, you will gain better top end. Find your trade off point.

What about mufflers?
This is where it gets interesting. The muffler you use will determine how your car sounds. There are many different ones out there, and different types. You can have the traditional canisters, which you see mainly in the tuner scene, then there's the Magnaflow/Flowmaster type. Here are pictures showing each:

Canister:


Flowmaster/Magnaflow:


The difference in these mufflers comes from inside. Quality mufflers will have better construction and better quality inside baffling, which will bring out nice sound from your exhaust. Cheap mufflers like the ones you see on Ebay will use sound metallic and tacky. My personal recommendation if you choose to get a canister would be either the Megan Racing N1 replica ($70-$80 on Ebay), or the OBX B10 ($50-$60 on Ebay).

How do I get the piping?
Now here comes the fun part. After you've purchased your muffler and decided on your piping size, you get the piping itself. You can buy DIY exhaust kits online, which are fine if you know how to weld, but otherwise I recommend going to a local exhaust shop. From here, you can tell them what you're wanting out of your exhaust system, plus you can customize your muffler placement/angle, as well as the design of the piping, so that you can get the most straight piping possible for your setup. I paid $130 for 2.5" piping on my Supra, this included the piping itself, a resonator, and the labor to put everything on. You will want to get piping from the cat to the back of the car. Basically they cut the piping off from where it runs into your cat, and then weld on bigger piping. Many exhaust shops will NOT condone the removing of your cat, nor do I condone it. This brings problems with emissions, as well as state inspections, not to mention your car will sound like crap. I highly recommend getting a resonator added in with your piping to ensure a better sounding exhaust, you'll be glad you did it.

Here is my final result with my Supra:









I hope this will give you guys a better understanding on what to look for and get when wanting to get an exhaust system.

-Matt
KAOS
Awesome write up Matt - thank you!
elastikman
Niceee post! smile.gif

Dont forget the Greedy (or replicas like OBX) SP2 muffler used by many owners 6gc!



Some blabla...tongue.gif

QUOTE
The GReddy SP2 Catback Exhaust Systems are 2nd-generation exhaust systems based on GReddy's famous SP catback system series. The GReddy SP2 (Street Performance) Catback Exhaust system continues GReddy's tradition of high-quality performance exhaust systems.

Through customer feedback, GReddy redesigned the SP2 catback exhaust as a full stainless steel catback exhaust system that is similarly priced to the original GReddy SP exhaust system. The new GReddy SP2 catback exhaust features a SUS304 stainless steel muffler canister with extra strong SUS430 stainless-steel end caps that feature a deep, high polish. Manufactured using state-of-the-art robotic seam welding, the single-wall canister of each GReddy SP2 catback exhaust features increased rigidity for maximum durability and life. The new GReddy SP2 catback exhaust system also features thick walled (1.5mm), polished SUS304 stainless steel mandrel bent piping for better resonance and vibration control and enhanced corrosion resistance and durability. New lightweight, flared and stamped stainless steel flanges are also used to provide improved sealing characteristics. With over 35 types of internal perforated tubes, each GReddy SP2 catback exhaust system is specifically tuned for the best combination of sound and performance.

The large, high volume GReddy SP2 exhaust muffler provides maximum exhaust flow with a deep, pleasing tone. The GReddy SP2 catback exhaust is especially effective when used on vehicles with an aftermarket turbocharger system.
The unique outer-curled oval exhaust tip is embossed with the famous GReddy logo.
Most GReddy SP2 exhaust systems are complete catback units, which do not effect emission related hardware. Each GReddy SP2 catback exhaust system is designed for a specific car application and can be bolted on out of the box, using factory mounting hangers.
GotToyota
Let's get this stickied! tongue.gif
Spider77
Yeah, you got a point. Everyday I see some question about exhaust in regards to piping size and mufflers. It would be nice to have a reference so people can just go right to it.
Athorn
I just got the obx muffler put on last week. I did not get larger piping from the catback because it sounds exactly like the stock muffler did. I think i will upgrade to the apexi n1 universal muffler and get 2.5 inch piping done. So i hope after that it will sound decent.
windowlicker
what diameter piping does the 1.8 liter have? just got the car a couple months ago and thinking about getting a different muffler.
GotToyota
I NEVER recommend welding a new muffler onto the stock piping, you will NOT see any benefits (other then sound, if you consider that one).
Athorn
I know you did not recomend it but i told the muffler shop what i wanted and they just welded it on to stock. But i did not get any sound diffrence from stock with the obx. It sounds like a prius lol. But i am thinking about going with this http://cgi.ebay.com/ebaymotors/ws/eBayISAP...rksid=p3907.m29 and get 2.5 inch cpiping from the ccatback..and watch as they do it this time. I think it will be diffrent i have never seen a black muffler and i think it will look pretty cool with my black celi. AND thanks for emailing that guy gotToyota..i did not mean to "shoot" the messanger.
GotToyota
You can go with that muffler, but you'll be getting the same results as with the OBX. IMO, it's not worth the extra $150 dollars just for a genuine Apexi. Go back to the exhaust shop, tell them you want to keep the OBX muffler, but just want 2.5" catback piping put on.

-Matt
windowlicker
QUOTE (GotToyota @ Aug 24, 2008 - 7:11 PM) *
I NEVER recommend welding a new muffler onto the stock piping, you will NOT see any benefits (other then sound, if you consider that one).


i bought the car for $700 and really don't care to spend money on this car. the stock muffler is breaking apart on the inside and has a little rattle to it. since you can get a fart can for like $30 off ebay, i figure what the hell. just wanted to know the stock piping diameter is.
Athorn
IS it the larger piping that gives you the sound becase right now mine is silent.
GotToyota
QUOTE (Athorn @ Aug 24, 2008 - 8:46 PM) *
IS it the larger piping that gives you the sound becase right now mine is silent.

Yes, the piping is what makes the difference most of the time. Though I know a guy that did the same thing as you and you can actually hear it.
Akirad1
who me mine sounds pretty good but i put the silencer back in the droneing sound was gettin on my nerves
Nyczroflz
yup... going catless def makes it louder... sometimes i wonder y i do things like that... kindasad.gif
Athorn
what if i went catless and got a resonater?
GotToyota
QUOTE (Athorn @ Aug 26, 2008 - 9:34 PM) *
what if i went catless and got a resonater?

Don't go catless. Get the 2.5" piping, and a resonator. If you go catless, regardless of the resonator, you will have a VERY raspy sound and not pass emissions.

EDIT: Nevermind on the emissions, I see you're from Florida. Oh well, you'll still sound like crap. wink.gif
Athorn
What will a respnater do? i dont think it cant be any quiter lol.
Akirad1
makes it quiter and its apart of emmisions so they arent legal to have off
Athorn
Does it come stock with a resonater?
Akirad1
cars yes they do its like the law or something lol
Athorn
Well i hope getting the larger piping will make the sound better... idk maybe my muffler is bad.
Akirad1
i dunno about that did you ever get the silencer out
Athorn
lol yes... after about in hour of pulling/twisting and yanking it came free.
AnaXyd
The Megan muffler, is this a noisy muffler? Or a smooth one, which makes nice sound instead of a lot of bad noise?
Athorn
So when the cut out the old muffler and piping they also cut out the resonater?
Akirad1
no the resonators by the cat i believe its b4 it but i could be wrong my brothers 3kgt had 4 and he cut two off but he lives where emmsions dont matter
95CelicaST
Resonators are there to... well exactly what they say - resonate. A resonated system will always sound more smooth and mellow to an identical non-resonated setup. If you're looking for rasp then a non-resonated system is the way to go. I had a non-resonated setup on my wrx and it sounded like a racecar. Swapped out for a resonated setup and it sounds much smoother now.
GriffGirl
IIRC the stock exhaust on an ST is 2.25". If you want to increase that, 2.5" is the best way to go from what I understand.
95CelicaST
QUOTE (GriffGirl @ Aug 27, 2008 - 3:55 PM) *
IIRC the stock exhaust on an ST is 2.25". If you want to increase that, 2.5" is the best way to go from what I understand.

Stock exhaust piping is 1.75". For ST's I would suggest 2.25" upgrade - 2.5" if you're going to end up Forced Induction.

For GT's I would suggest just getting 2.5".


Make sure on any setup you put in at least an 18" resonator.

I've had an SP2 style muffler, N1 style, and EVO2 style, and the best I've had personally, and heard on other Celicas is the EVO2 style muffler. If you want a nice deep tone PLEASE look into an EVO2 style.

Specifically, this is the muffler I had on my Celica - 2.25" piping. Best sound hands down. Clicky



GotToyota
The resonator is separate from the cat, and is somewhere before the muffler. It is NOT needed to pass emissions (I don't even think it affects it, just sound), but you will need a cat to do so.
Jaws4God
i can't find what size the stock exhaust is for the 3sgte..

presure2
QUOTE (Jaws4God @ Aug 31, 2008 - 10:15 PM) *
i can't find what size the stock exhaust is for the 3sgte..

its small. IIRC its just under 2.5", and has compression spots where it goes over the crossmember.

a couple of pics of a custom b-pipe i made for dustins swap.

3" mandrel bent stainless, with the super cool exhaust cutout. (remote actuator not pictured)

Click to view attachment

Click to view attachment
GTSOwner
What's the largest diameter exhaust you can run over the rear axle?
presure2
QUOTE (GTSOwner @ Sep 2, 2008 - 7:13 AM) *
What's the largest diameter exhaust you can run over the rear axle?

i've seen as large as 3" over the axle, but it takes a VERY good fabricator to make it work properly. (im not nearly that good yet....lol)

IMO anything larger than 2.5" shouldnt run over the axle, going that large,(3" or bigger..lol) with the bends it requires, IMO negates the advantages of having the larger pipe.

a couple pics of a downpipe and b-pipe i made for steffs turbo setup this weekend, to mount up to the greddy cat-back she got.(you can see where i added the v-band to the existing pipe laying behind the exhaust in the first pic.)

2.5" stainless mandrel bent, with custom turbo exhaust housing flange by randy (97lestyousay) and some super sweet vibrant v-band clamps. with those vbands, you get perfect alignment of the exhaust because the flanges have a male and female side to align them, and you also do not have to totally take them apart because of the cool snap together v-band that holds them together. ill get a couple pics of one that was left over later.





97lestyousay
That pulled up pretty nice, the first pics I saw with the flange sitting on the turbo made the gap
look a little bigger. smile.gif
Terracar
Here is a clear explanation of each a resonator and catalytic converter as well as their function. (courtesy of carexhaust.com)

Catalytic Converter
As already mentioned, the catalytic converter reduces harmful emissions from engine exhaust. It uses a combination of heat and metals that act as catalysts. A catalyst is a metal (or chemical) that causes other chemicals to go through a reaction without being affected itself. The inside of the catalytic converter consists of metals like aluminum oxide, platinum palladium. These metals cause the carbon monoxide and hydrocarbons to react and produce water vapor and carbon dioxide which are much less harmful to the atmosphere.

Resonator
The muffler alone cannot always quiet all of the engine noise. Many car exhaust systems also include a resonator which is like a mini muffler. They are usually straight pipes filled with sound muffling materials. The resonator can be either before of after the muffler in the exhaust system.

-Terracar
Terracar
Also wanted to add, man that exhaust work looks very nice..... perhaps you could open an exhaust shop on teh side tongue.gif

-Terracar
KAOS
QUOTE (Terracar @ Sep 3, 2008 - 8:02 AM) *
Also wanted to add, man that exhaust work looks very nice..... perhaps you could open an exhaust shop on teh side tongue.gif

-Terracar


I second that!
GotToyota
Bump up.
elastikman
Maybe next week the defective header i get from ebay, is repair...!

I will put straight exhaust Stainless pipe Size 2" with OBX SP2 - No Cat and no ressonator!
Lets see how this gone end...
GotToyota
QUOTE (elastikman @ Sep 21, 2008 - 2:13 PM) *
Maybe next week the defective header i get from ebay, is repair...!

I will put straight exhaust Stainless pipe Size 2" with OBX SP2 - No Cat and no ressonator!
Lets see how this gone end...

It's gonna sound like s**t, sorry to be the bearer of bad news, but no cat and ESPECIALLY no resonator will sound like ****! At least put on 1 resonator, even though I'd put on 2.

-Matt
97celiman
hey matt what was the name of the exhaust shop that did your supra?
GotToyota
QUOTE (97celiman @ Sep 22, 2008 - 9:44 PM) *
hey matt what was the name of the exhaust shop that did your supra?

It's called Big John's Muffler shop. Here is the yellow page info for it:

http://yellowpages.ardmoreite.com/Big+John...59328.home.html
hurley97
QUOTE (presure2 @ Sep 2, 2008 - 6:04 PM) *
2.5" stainless mandrel bent, with custom turbo exhaust housing flange by randy (97lestyousay) and some super sweet vibrant v-band clamps. with those vbands, you get perfect alignment of the exhaust because the flanges have a male and female side to align them, and you also do not have to totally take them apart because of the cool snap together v-band that holds them together. ill get a couple pics of one that was left over later.

Hey Manny, put up those pics of the v-band
elastikman
QUOTE (GotToyota @ Sep 22, 2008 - 10:29 PM) *
QUOTE (elastikman @ Sep 21, 2008 - 2:13 PM) *
Maybe next week the defective header i get from ebay, is repair...!

I will put straight exhaust Stainless pipe Size 2" with OBX SP2 - No Cat and no ressonator!
Lets see how this gone end...

It's gonna sound like s**t, sorry to be the bearer of bad news, but no cat and ESPECIALLY no resonator will sound like ****! At least put on 1 resonator, even though I'd put on 2.

-Matt


No problem...smile.gif thanks for you advise..
Yeah i like to put some resonator but is a little expensive here in my country.
Whats kind of resonator you advise??




GotToyota
QUOTE (elastikman @ Sep 23, 2008 - 6:53 PM) *
QUOTE (GotToyota @ Sep 22, 2008 - 10:29 PM) *
QUOTE (elastikman @ Sep 21, 2008 - 2:13 PM) *
Maybe next week the defective header i get from ebay, is repair...!

I will put straight exhaust Stainless pipe Size 2" with OBX SP2 - No Cat and no ressonator!
Lets see how this gone end...

It's gonna sound like s**t, sorry to be the bearer of bad news, but no cat and ESPECIALLY no resonator will sound like ****! At least put on 1 resonator, even though I'd put on 2.

-Matt


No problem...smile.gif thanks for you advise..
Yeah i like to put some resonator but is a little expensive here in my country.
Whats kind of resonator you advise??

To be honest, I don't know of the types, I just told my local exhaust shop that I wanted a resonator, and they put one on.

-Matt
Daftboy
I did all of mine with magnaflow, muffer cat and res.

its 2.5 form the header going into a 2.25 all the way back
GotToyota
Sounds nice, any pictures?
Daftboy
Ummm some where...lol...ill look around for them
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