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Toyota Supra Forums! Join the Supra forum! (http://www.toyota-supra.info/forums/)
-   MKIII Supra (http://www.toyota-supra.info/forums/mkiii-supra/)
-   -   Exhaust size... (http://www.toyota-supra.info/forums/mkiii-supra/16465-exhaust-size.html)

Chi_Town_MK3 03-27-2010 03:56 PM
Quote:
Originally Posted by Green7mgte (Post 80748)
christ. you should be trying to run 500 hp or better with 20psi..
f it. if you got the cash go bigger. if you can find 4" the whole way out.

"note" I did not look at his current specs. I am not saying running 20psi is warranted for his current build. just stating my opinion.
I found a 4" dp for like $350 and 4" cat-back for like $900 and for 3" dp was like $260 and 3" cat-back was like $700 so its not much more an it sound better IMO.

my goal is around 500hp-550hp for this summer

Green7mgte 03-27-2010 06:13 PM
im sure there might be some minor things that take their tole by using a huge exhaust.. gass milliage or what have you. I THINK the only downfall would be back pressure. but that's for n/a's so nothing for turbo's to worry about.

Chi_Town_MK3 03-27-2010 08:47 PM
Quote:
Originally Posted by Green7mgte (Post 80766)
im sure there might be some minor things that take their tole by using a huge exhaust.. gass milliage or what have you. I THINK the only downfall would be back pressure. but that's for n/a's so nothing for turbo's to worry about.
well I been reading up on another Supra forum site 2day and they were saying will lose low-end TQ but will gain top-end HP and can run more boost due to the better flow and Turbos work better with less back pressure, back pressure is only needed for n/a cars

Green7mgte 03-28-2010 01:38 AM
Quote:
Originally Posted by Chi_Town_MK3 (Post 80770)
back pressure is only needed for n/a cars
Quote:
Originally Posted by Green7mgte (Post 80766)
the only downfall would be back pressure. but that's for n/a's so nothing for turbo's to worry about.
yea i know.

87mk111 03-30-2010 12:28 PM
The only downside I could think off would be clearance; if you have lowered the car, 4" exhaust might bottom out easily. Just a thought.

907mge 03-30-2010 03:31 PM
yeah that sure is true mine is lowered and my 3in cat has a few scrapes on it already

Chi_Town_MK3 03-30-2010 11:08 PM
Quote:
Originally Posted by 907mge (Post 80868)
yeah that sure is true mine is lowered and my 3in cat has a few scrapes on it already
the cars sits on stock springs and 17" rims with 245/45/R17 front and 255/45/R17 rear

super83 03-31-2010 10:59 AM
im running a 4.5 megan on my supra and it idles very low yes it does get loud when i get on it but its deep and sounds amazing.

Chi_Town_MK3 03-31-2010 11:44 PM
Quote:
Originally Posted by super83 (Post 80900)
im running a 4.5 megan on my supra and it idles very low yes it does get loud when i get on it but its deep and sounds amazing.
U just running that size muffler? Because Im looking to run a 4" from the turbo back

super83 04-01-2010 01:17 AM
yeah it has a very deep tone to it, i took out the cat and just ran a straight pipe, muffler was only 90$ i dont buy full set ups because i dont want to pay that much for some chrome pipe.


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