500hp+ Exhaust question - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 04-22-2012, 09:42 AM Thread Starter
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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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[CENTER]2012 King Ranch
22k deleted at 1k
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S&B Intake
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466/953 on 37's
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post #2 of 17 Old 04-22-2012, 09:45 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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post #3 of 17 Old 04-22-2012, 10:20 AM Thread Starter
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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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[CENTER]2012 King Ranch
22k deleted at 1k
5" FLO-PRO
S&B Intake
Sinister Egr Delete
MiniMax/ SPE Tunes
466/953 on 37's
6" 4 link
37's on 22's
Bags and compressor
RBP mudflaps
transfer tank tool box.
9" 2" poly boss v blade
Should have kept my 6.0.....
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post #4 of 17 Old 04-22-2012, 10:24 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 10:29 AM.
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post #5 of 17 Old 04-22-2012, 11:21 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.

Nate
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post #6 of 17 Old 04-22-2012, 07:49 PM Thread Starter
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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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[CENTER]2012 King Ranch
22k deleted at 1k
5" FLO-PRO
S&B Intake
Sinister Egr Delete
MiniMax/ SPE Tunes
466/953 on 37's
6" 4 link
37's on 22's
Bags and compressor
RBP mudflaps
transfer tank tool box.
9" 2" poly boss v blade
Should have kept my 6.0.....
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post #7 of 17 Old 04-22-2012, 07:56 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.

Kurt


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post #8 of 17 Old 04-22-2012, 08:17 PM Thread Starter
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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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[CENTER]2012 King Ranch
22k deleted at 1k
5" FLO-PRO
S&B Intake
Sinister Egr Delete
MiniMax/ SPE Tunes
466/953 on 37's
6" 4 link
37's on 22's
Bags and compressor
RBP mudflaps
transfer tank tool box.
9" 2" poly boss v blade
Should have kept my 6.0.....
2003kingranch is offline  
post #9 of 17 Old 04-23-2012, 12:43 PM
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I would put that money into the trans fund.

Chad

2003 6leaker
N.E.W 2.5 Truck
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post #10 of 17 Old 04-23-2012, 12:56 PM
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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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