# home made exhaust question
**URL:** https://forums.speedlife.net/t/home-made-exhaust-question/84585
**Category:** SON240sx Automotive
**Created:** [March 29, 2005, 5:40am UTC](https://forums.speedlife.net/t/home-made-exhaust-question/84585 "2005-03-29T05:40:54Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@s13Junkyard](https://forums.speedlife.net/u/s13Junkyard)
#### Post date: [March 29, 2005, 5:40am UTC](https://forums.speedlife.net/t/home-made-exhaust-question/84585/1 "2005-03-29T05:40:54Z")
ok so im most likly going to make my own catback exhaust for my new car.
i was thinking 3" stainless steel piping from the downpipe to the very end no resonator and a 3" highflow cat at the end to go where a muffler would go.
i know its loud and i do not care haha…
do you guys think the cat will heat up enough to pass e-test?
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### Author:  [@boMex](https://forums.speedlife.net/u/boMex)
#### Post date: [March 29, 2005, 6:07am UTC](https://forums.speedlife.net/t/home-made-exhaust-question/84585/2 "2005-03-29T06:07:02Z")
Mounting the cat closer to the engine will make sure it gets hot quick and stays hot.
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### Author:  [@Theo23](https://forums.speedlife.net/u/Theo23)
#### Post date: [March 29, 2005, 3:51pm UTC](https://forums.speedlife.net/t/home-made-exhaust-question/84585/3 "2005-03-29T15:51:48Z")
with the piping being 3" and at the very back, I don’t think it will pass, it won’t get hot enough. High flow cats don’t resrict too much flow.
This for Turbo or N/A?
Theo
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### Author:  [@roast](https://forums.speedlife.net/u/roast)
#### Post date: [March 29, 2005, 4:30pm UTC](https://forums.speedlife.net/t/home-made-exhaust-question/84585/4 "2005-03-29T16:30:44Z")
> [@Theo23](#):
>
> with the piping being 3" and at the very back, I don’t think it will pass, it won’t get hot enough. High flow cats don’t resrict too much flow.
>
> This for Turbo or N/A?
>
> Theo
It would be for a turbo setup.
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### Author:  [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)
#### Post date: [March 29, 2005, 5:28pm UTC](https://forums.speedlife.net/t/home-made-exhaust-question/84585/5 "2005-03-29T17:28:13Z")
It will heat up defenatly…
I say do it dude… Karl Runs it on the street and has never been hassled.
They put a heat gun to it and the precentage difference met the standard.
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### Author:  [@Doba](https://forums.speedlife.net/u/Doba)
#### Post date: [March 30, 2005, 4:36am UTC](https://forums.speedlife.net/t/home-made-exhaust-question/84585/6 "2005-03-30T04:36:48Z")
im running a custom 3" with no cat…with a turbo it wont be that loud
and im pretty sure youll warm up that cat without a problem.
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### Author:  [@Pavel](https://forums.speedlife.net/u/Pavel)
#### Post date: [March 30, 2005, 6:21am UTC](https://forums.speedlife.net/t/home-made-exhaust-question/84585/7 "2005-03-30T06:21:41Z")
Thanks for copying my ideas Avery, not telling you anythin again. :evil:
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### Author:  [@Jesse](https://forums.speedlife.net/u/Jesse)
#### Post date: [March 30, 2005, 3:50pm UTC](https://forums.speedlife.net/t/home-made-exhaust-question/84585/8 "2005-03-30T15:50:28Z")
yeah i run coughtestpipecough with full 3in no resonators and its really not that loud. Might be raspy when cold and not under boost
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### Author:  [@s13Junkyard](https://forums.speedlife.net/u/s13Junkyard)
#### Post date: [March 30, 2005, 6:37pm UTC](https://forums.speedlife.net/t/home-made-exhaust-question/84585/9 "2005-03-30T18:37:53Z")
u never told me that pavel
i stole the idea from An STI at adams work
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### Author:  [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)
#### Post date: [March 30, 2005, 6:44pm UTC](https://forums.speedlife.net/t/home-made-exhaust-question/84585/10 "2005-03-30T18:44:34Z")
lol, pavel probably stole it from karl… damn thiefe 😉