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post Feb 23, 2015 - 9:43 AM
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Gooch

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So I'm looking to buy a custom header and I need to know what's a good size piping would be for it?
 
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post Feb 23, 2015 - 11:31 AM
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Smaay

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thank you for saying header and not headers!

first off what engine do you have? might help get an answer


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2001 Celica GT-S Turbo
1997 Supra TT 6speed
1997 Celica 3MZ/1MZ swap
1990 Celica All-Trac
post Feb 23, 2015 - 1:38 PM
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Jmk91

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His profile says he has a 97 st.
post Feb 23, 2015 - 3:05 PM
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Gooch

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QUOTE (Smaay @ Feb 23, 2015 - 12:31 PM) *
thank you for saying header and not headers!

first off what engine do you have? might help get an answer



I have the 1.8 liter engine
post Feb 23, 2015 - 5:07 PM
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igpx12



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QUOTE (Gooch @ Feb 23, 2015 - 3:05 PM) *
I have the 1.8 liter engine


If you have a stock 1.8L you'd want to probably go as far as 2.5 at most, 2.25 would be the optimal sizing for the amount of back pressure needed.


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post Feb 23, 2015 - 7:26 PM
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Gooch

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QUOTE (igpx12 @ Feb 23, 2015 - 6:07 PM) *
QUOTE (Gooch @ Feb 23, 2015 - 3:05 PM) *
I have the 1.8 liter engine


If you have a stock 1.8L you'd want to probably go as far as 2.5 at most, 2.25 would be the optimal sizing for the amount of back pressure needed.


That's what I was thinking but I'd figure if ask first! But thank you!
post Feb 23, 2015 - 8:24 PM
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Bitter

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2.5 is too big for the 1.8. 2.25 is the largest, 2 is actually about right.


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post Feb 23, 2015 - 9:30 PM
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Box



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That or spend the money on something worthwhile like suspension, either way. tongue.gif


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post Feb 23, 2015 - 9:34 PM
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Jmk91

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I agree with box haha. You won't really notice any different between stock manifold and header. I have the 5sfe spent 230$ on a good header and 260ish on an injen short ram intake. Hardly can tell a difference besides after 5k rpms its worthless now before I'd at least have 5200ish haha. Just save up for a swap or put it in Suspension.
post Feb 23, 2015 - 10:02 PM
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Bitter

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Actually the 7A really takes nicely to the header! I noticed a pretty decent change in how the engine performed and a good gain in gas mileage to boot, and it's not just me. These are a very popular replacement for cracked factory manifolds at toyotnation forums and owners there also report a bump in gas mileage and a real feel in power. A few people compared pre and post header MPG averages and saw solid 3-4mpg gains over a period of time long enough to filter out seasonal changes and driving habits.


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post Feb 23, 2015 - 11:10 PM
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Smaay

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I have a 7A header and downpipe for sale. in is the for sale section


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2001 Celica GT-S Turbo
1997 Supra TT 6speed
1997 Celica 3MZ/1MZ swap
1990 Celica All-Trac
post Feb 24, 2015 - 12:01 AM
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Box



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Oddly enough European 7A-FE models have a header from the factory and no pre-cat, was rated for 10 more hp if I recall correctly. If you do everything yourself you can almost break even just from scrapping the cat.

I would just tie that in with the stock exhaust to keep obnoxious sounds to a minimum, then buy a 7GC short-shifter and some suspension. Nice tires go a long way as well.


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post Feb 24, 2015 - 12:14 AM
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Gooch

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QUOTE (Box @ Feb 23, 2015 - 10:30 PM) *
That or spend the money on something worthwhile like suspension, either way. tongue.gif


Well my header has a crack in it so ima need one anyway I was just looking into getting something that'll actually last. But suspension is always good too!
post Feb 24, 2015 - 10:04 AM
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cheela



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yup, they are prone to cracking. only reason I replaced mine. I didn't spend more than $70 on my header and intake. lol. any more wouldn't be worth it for me since I hope to swap one day.


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post Feb 24, 2015 - 6:00 PM
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Box



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QUOTE (Gooch @ Feb 23, 2015 - 11:14 PM) *
QUOTE (Box @ Feb 23, 2015 - 10:30 PM) *
That or spend the money on something worthwhile like suspension, either way. tongue.gif


Well my header has a crack in it so ima need one anyway I was just looking into getting something that'll actually last. But suspension is always good too!

Fair enough, as the aftermarket header is actually cheaper than an aftermarket replacement manifold. Depending on your local emissions/inspections and what have you there may be no choice but to get an o.e. replacement. As the header gets rid of the pre-cat, which would fail a visual but should pass a tailpipe provided you bring the car in up to temp. There's info here on getting the header to work with the factory exhaust as the header is actually meant for a Corolla and there's a gap between the downpipe and the rest of the exhaust with the Celica.


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post Feb 24, 2015 - 9:03 PM
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Bitter

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Not all 7A have a warmup cat on the manifold.


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post Feb 24, 2015 - 10:14 PM
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Box



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Mine was a Federal spec OBDI car that spent its entire life in Alabama and it had one, so I dunno. All the ones I've ever seen inside the U.S. have had them. I knew the European cars don't have them.

This post has been edited by Box: Feb 24, 2015 - 10:14 PM


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post Feb 24, 2015 - 10:21 PM
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Gooch

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QUOTE (Box @ Feb 24, 2015 - 7:00 PM) *
QUOTE (Gooch @ Feb 23, 2015 - 11:14 PM) *
QUOTE (Box @ Feb 23, 2015 - 10:30 PM) *
That or spend the money on something worthwhile like suspension, either way. tongue.gif


Well my header has a crack in it so ima need one anyway I was just looking into getting something that'll actually last. But suspension is always good too!

Fair enough, as the aftermarket header is actually cheaper than an aftermarket replacement manifold. Depending on your local emissions/inspections and what have you there may be no choice but to get an o.e. replacement. As the header gets rid of the pre-cat, which would fail a visual but should pass a tailpipe provided you bring the car in up to temp. There's info here on getting the header to work with the factory exhaust as the header is actually meant for a Corolla and there's a gap between the downpipe and the rest of the exhaust with the Celica.

I was looking into getting a custom header and the guy asked what size I was looking for so I figured I should ask first! And I was guna get all new everything after I get this anyway.

This post has been edited by Gooch: Feb 25, 2015 - 10:04 AM

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