another dumb exhaust question

shaggy337 · #1 (**permalink**) 11-01-2007, 05:32 PM

I had a buddy of mine tell me that if you run a 5" straight pipe on an all stock truck(2007 f-250 6.0L psd) that it would run like crap. Is this true I was lead to believe that after the turbo the bigger the better, that you wanted zero back presure.

**Dave** · #2 (**permalink**) 11-01-2007, 05:38 PM

Stock 6.0's do need some backpressure. Some Straight piped stock 6.0s will set a CEL some wont.

shaggy337 · #3 (**permalink**) 11-01-2007, 05:41 PM

what is a CEL

**Dave** · #4 (**permalink**) 11-01-2007, 05:43 PM

CEL is a check engine light. sorry about that

shaggy337 · #5 (**permalink**) 11-01-2007, 05:46 PM

oh right i should of caught that. Man i really want that 5" from mbrp but im not doing any mods for awhile( tight Budget).

benderado · #6 (**permalink**) 11-01-2007, 05:50 PM

From what i've heard and read, a 5" will only benifit if your truck is makin' over 500hp. Otherwise, a stock truck won't run quite as well as a 4" exhaust.

shaggy337 · #7 (**permalink**) 11-01-2007, 05:58 PM

yea but if your going to straight pipe it you think 4" or 5" would be pretty close to the same

DieselViking · #8 (**permalink**) 11-01-2007, 07:37 PM

3.5 to 4 in. is approx. a 15% increase in flow. So 4 to 5 in. would be around 30% increase in flow if my math is right? A stock motor does not need a 30% increase in flow. 4 in. is more than enough. Just get a 6 inch tip that'll fit a 4 inch pipe man.

ilovestrokinit · #9 (**permalink**) 11-01-2007, 07:42 PM

you could jst straight pipe it with stock tubing

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