3sge header on 5sfe, have some questions. Options

[FSX_Celica94GT]

ok, so recently i bought a 3sge header...just the header, no d/p, no gaskets, no nothin. So i bring it to an exhaust shop and ask them to make me a d/p, and they said they cant do it until i put a flange on the header, so i took it to a welding shop, he made a really good flange for me for about 86 bux. Then i take it down to the exhaust shop again and see if they can make the d/p for me after all this time waiting, THEN they said they cant do it unless the headers on the car and said i'd have to get a gasket for it. He also said i'd have to get it put on, then drive it straight down to his shop OPEN HEADER, NOT CONNECTED TO THE EXHAUST, after that and then he can make the d/p for it. My questions are, will driving on an open header hurt my engine in anyway? will it be really loud? cuz i dont wanna get pulled over driving on an open header. Also, would a 3sge gasket work on my block? or will i have to get a gasket made?
3sge flange
is a flange the same thing as a gasket? if not, then i'll have to get one made i guess, but if that is what i need, will the bolt holes line up the same on my block?



This post has been edited by FSX_Celica94GT: Aug 27, 2005 - 11:39 AM

[Bigmeanbulldog55]

Just use a 5s gasket. The only thing I would worry about is the fact that the 3sge header is really short. If it's pointing towards anything that could melt, it will melt it. Most cops will understand if you on your way to get it hooked up. And yeah, it'll be really loud. This flange thing confuses me though. The header didn't come with one? That just sounds like a "do it your self" header kit. That might be cheaper to go that way. Getting an H22, or B18 header, chopping it, and welding it to a 3sge flange.

[FSX_Celica94GT]

my friend told me its bad for my engine if i drive w/o my exhaust connected to my header, so i might just have to get the d/p made at the place where im getting the header put on. So just to be sure, i wont need a gasket for the header, my stock one should work?

[Bigmeanbulldog55]

You'll want a new gasket for it when it's on for good. If your just putting it on to drive it somewere, then you can use your old. It won't hurt the engine machanicly in any way to run with open header. Like I said, only thing it could do is melt something for the exhaust heat/gasses.

This post has been edited by Bigmeanbulldog55: Aug 27, 2005 - 11:42 AM

[FSX_Celica94GT]

ok, well, i really dont wanna risk it, so im just gonna get the d/p made at the place thats putting the header on, thanx for the help, but i think i might get the flange anyways just to be sure that it will fit, its only 30 bux anyway.
Is that 3sge flange the same thing as a gasket? as in it goes between the block and the header? someone told me that the stock one might crack if i dont get a good one, i just wanna be sure that nothing goes wrong w/ this and i want everything to make this work right.

This post has been edited by FSX_Celica94GT: Aug 27, 2005 - 7:01 PM

[FSX_Celica94GT]

bump

[Phat_99CeliGT]

when i put my header on i used the 5sfe gasket i bought at autozone.
Drove it open header 30 minutes away to get the DP welded on.
all they had to do was cut the old flange off my stock DP and weld the new one on and bolt it together.

[FSX_Celica94GT]

ok, thanx phat, but the question i really need answered is about the gaskets and flanges. Are they the same thing? is that 3sge "flange" on ebay the same as a 3sge "gasket"? i really dont wanna use my stock one and it break while the headers on. Does the flange that they made for my d/p count as a gasket? i dont wanna take it there and them tell me i need gaskets for this and that.

[FSX_Celica94GT]

bump

[Galcobar]

Flange is the piece of flat metal on the end of each section that allows the various sections to bolt together -- basically a flare on either side of the piping to make room for a bolt.

A gasket is a seal -- think weatherstripping for your exhaust. It keeps the exhaust gas inside the piping. A gasket goes between two flanges (on the piping) or between the engine and the manifold flange, which are then bolted tight to create the seal.

[FSX_Celica94GT]

lol, k, well guess im gonna have to get some gaskets made, dont want any gasses escaping the piping. I should be able to use my stock one for my block, but where do i get a gasket for my d/p made? would that welding shop make me one?

[Galcobar]

Since the DP has to fit the 3SGE's stock manifold, you should be able to get gaskets to fit between the two.

[FSX_Celica94GT]

but since i will have to get a d/p made for the header, wouldnt the gasket that goes between the header and d/p be completely different? unless the bottom of the header is shaped like the stock manifold, which i dont kno cuz i cant find a picture of a stock 5sfe manifold anywhere.

[Galcobar]

The gasket you would be buying matches the 3SGE manifold. The flange on the downpipe you're having made must match the 3SGE manifold. Since the gasket and the DP will match the 3SGE manifold, they will match each other.

If the flange on the DP doesn't match the gasket for the 3SGE manifold, it won't match the 3SGE manifold.

This was a 3SGE manifold with the downpipe that I came across on Ebay a long while ago:



This post has been edited by Galcobar: Aug 31, 2005 - 9:07 PM

[FSX_Celica94GT]

where can i get the gasket?

[FSX_Celica94GT]

bump

[Galcobar]

Autopart store. Just ask for 3SGE manifold and exhaust gaskets.

BTW, the bottom of the 5SFE's log-style manifold attaches to the catalytic converter. You'll have to get on put in underneath the body of the car if you switch to the 3SGE manifold.

[Jaws4God]

So what all options are their for headers for the 5sfe engine? I am not very knowledgable about engines so bear with me... but i'd like to get a better flowing header..

Autopart store. Just ask for 3SGE manifold and exhaust gaskets.

BTW, the bottom of the 5SFE's log-style manifold attaches to the catalytic converter. You'll have to get on put in underneath the body of the car if you switch to the 3SGE manifold.
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don't we already have a cat under the car?

[FSX_Celica94GT]

dang, so now i have to buy a new cat too? is it really necessary? if it is, please tell me o'reilys or autozone carries some and tell me they're cheap lol, im gonna end up spending some much money on this after its done.

[Galcobar]

Catalytic converters are only necessary if you want to pass emissions and like the idea of breathing clean air.

I don't have a diagram of the various exhaust configurations of 6g Celicas, so I can't be absolutely definitive on your car. Try looking...you might not know what to look for if the cat is attached to the 5SFE manifold, but an underbody cat is fairly unmistakable.



If it's already there, then you won't need a new cat. If it's not, then you're losing your cat with the 5SFE manifold.

Also, be aware of where the header is joining your exhaust piping -- you might require a new flex pipe as well if it's part of the down-pipe instead of the mid-pipe.

If you do have to get a new cat, you might as well replace the flex pipe at the same time. The usual place for the underbody cat is where the stock resonator sits. I would suggest getting a cat with a resonated core, such as the MagnaFlow 9440x line, to combine sound suppression with the cat. Flex pipes can be had on Ebay for relatively cheap. You can get universal cats from your local autoparts store, though I'd be tempted to use on of the online wholesalers such as fle-online.com or hottexhaust.com to get the best price. Most ship free over $50, and most free-flowing cats are more than that.

One final point -- if you're planning on upgrading the rest of your exhaust later, say to 2.25" piping, make sure your downpipe, flex pipe, cat and connecting piping are of the upgraded size, and have the exhaust shop put a reducer (transitions for 2.25" to 2") to mate the new pieces with your stock exhaust.