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Old 04-22-2012, 08:42 AM
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500hp+ Exhaust question

As in my sig i have a 4" MBRP with a 3.5" down pipe. very shortly (next mon (30th) my truck will break the 500hp+ mark. 190/75's and a 68mm RCD. while the truck is apart and motor out, i was thinking of buying a 5" exhaust with a 4" down pipe. or is bigger exhaust unnecessary. there's all kinds of crazy numbers people throw around and claim like with the stock intake will take 500 hp, 4' exhaust is good under 500hp ect.. i dont want to get the truck together and find out the exhaust is borderline to small.
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Old 04-22-2012, 08:45 AM
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In my experience a 5" exhaust can be a want not a need, I have been around diesel trucks on dynos for 15 years and do not see a any benifits to 5" exhaust unless you want it louder. I find the 5" drones too much and have seen 800HP work great with 4" exhaust.

my 2 cents

Dave
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Old 04-22-2012, 09:20 AM
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im not to worried about the sound. i was thinking egt's. but if 4" is fine thats $500 i dont have to spend
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Old 04-22-2012, 09:24 AM
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you might want to get just the 4inch downpipe, i dont think you need it but it might help with egt's

Last edited by R0tten; 04-22-2012 at 09:29 AM.
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Old 04-22-2012, 10:21 AM
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yea if anything, just get the 4in down pipe but a 5in is NOT required at all. not saying i dont like mine because I do but it is definitely not required.
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Old 04-22-2012, 06:49 PM
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i might just get 4" down pipe then. i want to do a single stack. but my trucks way too nice to cut a hole in the bed
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Old 04-22-2012, 06:56 PM
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Honestly I think you'll be just fine with what you have. Go with a 4" DP if you want, but I don't think it will be necessary with a drop in turbo, even a 68mm Pmax. 4" DP's are a pain in the butt.
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Old 04-22-2012, 07:17 PM
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4" downpipe will be easy with the motor out 3.5" downpipe isn't very big. someone dynoed 580 with190's and a 68. I'm on the fence on what I should do.


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Old 04-23-2012, 11:43 AM
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I would put that money into the trans fund.
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Old 04-23-2012, 11:56 AM
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Quote:
Originally Posted by 2003kingranch View Post
4" downpipe will be easy with the motor out 3.5" downpipe isn't very big. someone dynoed 580 with190's and a 68. I'm on the fence on what I should do.


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Not really, being the 4" pipe doesnt really clear the firewall on 03-04 trucks... It always gets wedged between the cabs when they come down and rattles unless you beat the firewall. The turbo needs an equal diameter down pipe to match the turbine outlet, the stock turbo and all the upgraded VGT's are 3.5" outlet, so the 3.5" down pipe is sufficient
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