How much back pressure do you need in exhaust?

by **solara blues** » Sat Nov 01, 2003 7:01 pm

I would like to modify my exhaust, probably from the manifold back, bypassing the cat converter. I know the engine requires certain amount of back pressure for the high end. I have a v6 s/c, does anybody have any suggestions for the exhaust? :roll:

by **Yanks0114** » Sun Nov 02, 2003 1:27 am

Please explain to me how this belongs in the DIY section???

Backpressure can't really be measured but stick with an aftermarket catback exhaust like the apexi world sport, greddy evo or JIC

by **Yanks0114** » Sun Nov 02, 2003 1:27 am

BTW backpressure is for low end and not high end

by **solara blues** » Sun Nov 02, 2003 10:54 am

would eluminating the cat converter significally increase the hp?

by **Jackass-Jeff** » Sun Nov 02, 2003 11:08 am

i'm guessing eluminating = eliminating...

It'll free up the exhaust for more high end but not by much... it's not worth it due to expections/smog laws... (unless your state doesn't have these laws)

by **Mossy** » Sun Nov 02, 2003 7:22 pm

SOoOoOoO straight pipes were a bad idea?

by **impactX** » Mon Nov 03, 2003 12:52 am

straight pipe? try running a turbo with open dump hahaha! now that's fun...

by **HKSV6SLE** » Mon Nov 03, 2003 3:04 am

getting rid of the cat doesnt do much and in CA anywys is illegal, you could replace it with a random technology cat tho....

by **SolaraT** » Mon Feb 02, 2004 4:10 pm

I just asked random tech for an application for our cars. I'm sure they got one. I want one now. Any other vendors that make good hf cats?

by **Mole** » Mon Feb 02, 2004 5:11 pm

cats are cats, its the overall dimension that will help you out.

i have a highflo 2.5 inlet and outlet. comparing to a stock one which is 2'

i dont notice any difference.

by **Mudd** » Mon Feb 02, 2004 5:27 pm

I've never scared as many old people as I do with my o2 dump in my DSM. It's louder than hell.

impactX wrote:straight pipe? try running a turbo with open dump hahaha! now that's fun...

by **MGLax13** » Mon Feb 02, 2004 10:46 pm

If you go custom, 2.25" piping is the way to go. You wont lose any low end from waht I understand. I went with 2.5" and I don't feel any loss but maybe if I dyno'd it I would, I dunno, it sounds nice so I'm happy.

Website · by **TRD_solaRa** » Tue Feb 03, 2004 12:07 am

Hey I'm new on this forum and find it really interesting. Majority of you guys really seem to know your stuff. Anyways, I'm thinking about doing a custom piping (2.5") :evil:

for my Solara. I wanted to do it straight from where the headers end. So I want to take out the cat. But . . . I was wondering if this would effect the O2 sensor or any other sensors on the car. When I ran at the track, I "blew" my O2 sensor somehow

. . . prolly pounding it too much. But if you guys know anything of this, holla back. :wink:

peace.

by **Mole** » Tue Feb 03, 2004 8:12 am

we all know this much b/c of the expirence of trial and error.

you should just have a muffler shop over there produce a new Ypipe. thats where the real bottleneck is on the 1mz's exhaust.

How much back pressure do you need in exhaust?

How much back pressure do you need in exhaust?

back pressure

Custom 2.5" dual exhaust

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