Cutting stock exhaust? - Ford Powerstroke Diesel Forum
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post #1 of 25 Old 10-09-2010, 09:18 AM Thread Starter
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Cutting stock exhaust?

It seems the accepted standard is a 4" straight pipe all the way back. Would it not be the same amount of flow and back pressure by cutting back the stock system, for example cutting it half way so it dumps under the truck? i already straight piped the stock 3.5" exhaust but it runs all the way back to the stock point.

e99 f250 ccsb, looks stock... she calls it my other girlfriend
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post #2 of 25 Old 10-09-2010, 12:49 PM
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you still are pushing through a 3.5 half the way, and then you have to deal with soot under and up the side of your truck.

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post #3 of 25 Old 10-09-2010, 01:07 PM
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im pretty sure stock is 3" but turbo diesels. dont require "backpresure"
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post #4 of 25 Old 10-09-2010, 02:53 PM
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i cut my stock exhaust right infront of the muffler. not to bad of an issue with soot unless i turn my programmer on. sounds ok. really loud in the cab. i am still going to put on a 4" exhaust though.

2000 F250 SD ex cab long bed
6spd trans
south bend 350hp-750lb/ft clutch
6 in lift with 37in Km2 BFG
4in mbrp turbo back single exhaust
TS 6 Pos Chip
DIY intake
SOON TO COME
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post #5 of 25 Old 10-09-2010, 05:37 PM
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Quote:
Originally Posted by wiyrs View Post
im pretty sure stock is 3" but turbo diesels. dont require "backpresure"
stock is 3.5" on my truck.

Vince
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FOR SALE '99F350 2008 F350 mini maxx'd

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post #6 of 25 Old 10-09-2010, 07:20 PM
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IMO let it be. 3.5 is plenty unless you're pushing a ton of power(aka over 500hp) and dont dump it under the truck its noisy as crap. had mine that way wasnt fun.
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post #7 of 25 Old 10-09-2010, 07:25 PM
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i had mine sawed off before the muffler before i had the stacks and the bottom of the truck was black and it stained the license plate. also made the truck smell like cancer

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post #8 of 25 Old 10-09-2010, 09:03 PM Thread Starter
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Quote:
Originally Posted by Dietoremain View Post
IMO let it be. 3.5 is plenty unless you're pushing a ton of power(aka over 500hp) and dont dump it under the truck its noisy as crap. had mine that way wasnt fun.
thanks for the responses, I kinda figured this was the answer. I'm not making that kind of power nor plan on it....because I can't afford it.

e99 f250 ccsb, looks stock... she calls it my other girlfriend
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post #9 of 25 Old 10-09-2010, 09:17 PM
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If you're not looking at heavy load hauling-you have an early 99-right?
Just get rid of caty converter-pipe it through-
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post #10 of 25 Old 10-10-2010, 09:09 AM
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stock exhaust is good for around 400HP all day long, alls your going to see with 4 and 5 is a slight drop in egts but the noise is going to increase alot, the 5" is extremely deep, i love it

05+ coils, 10 Rear diff, box, tailgate, lights, bumper, Full 07 front harley swap...the list is endless.

AS IM RARLEY on here anymore...have a question ?? EMAIL ME dakinbryce@hotmail.com..ill gladly answer any of your questions. OR search me on facebook. ill help out anyway I can !

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