5 inch Exhaust

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Dec 31, 2007 | 12:50 PM

mitchf2506.0

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5 inch Exhaust

I have a 03 Ford F250 6.0 and I was wondering if I could straight pipe my truck with 5 inch turbo back? Will it thow any codes with no cat? What should I do with the o2 sensor?

Dec 31, 2007 | 12:54 PM

BGMSPD

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From: Sarasota, FL

There is no O2 sensor so no worry of any codes. And i don't believe the 5" downpipe fits without a lot of persuasion from a hammer or a jack agains the firewall.

and welcome to FTE. do a search on the exhaust and you'll find plenty of reading for days.

Dec 31, 2007 | 01:03 PM

mitchf2506.0

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how far back will I have to beat back the fire wall? Is it a hard job to do all this?

Dec 31, 2007 | 01:07 PM

BGMSPD

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From: Sarasota, FL

i don't know, i have a 4" downpipe, but i've read about guys going larger and having to "adjust" the firewall in certain spots.

Dec 31, 2007 | 01:11 PM

mitchf2506.0

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Dp you have four inch all the way back straight piped or do you have a muffler? Did that help with MPG?

Dec 31, 2007 | 02:43 PM

BGMSPD

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I'm running a 304ss kit from mbrp turbo back with no muffler. i still have the cat in place for legal reasons. it seems to keep the egt's down a little with the programer and it's a little louder than stock.

i gotta clarify i have a 3 1/2 " downpipe that goes into the cat. after the cat it changes to 4" all the way out.

Last edited by BGMSPD; Dec 31, 2007 at 02:46 PM.

Dec 31, 2007 | 03:10 PM

GregsSD

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From: NorCal

A 3-1/2" downpipe will fit easy, but a 4" downpipe needs some hammering or crimping usually to make it fit so I don't know how you would be able to fit a 5" downpipe at all or if anyone even makes a kit with a 5" downpipe.

There is no o2 sensor and removing the cat and muffler will not throw any codes.