Difference between exhaust sizes - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 04-08-2012, 03:59 PM Thread Starter
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Difference between exhaust sizes

What are the gains between a 5in exhaust and a straight piped stock 3.5in? I do a little towing but nothing major and don't really need anymore performance out of the truck. Wouldn't mind a little more but I'm trying to figure out if it's worth the money or not.
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post #2 of 3 Old 04-08-2012, 04:20 PM
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5" is going to be a lot deeper that just a cat/muffler delete and even a 4" straight pipe.

Its has no performance gain over a 4".

E99 7.3L ECLB 4x4
140,000 miles
4" lift on 33s
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post #3 of 3 Old 04-09-2012, 11:00 AM
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4" seems to be a standard upgrade. It will reduce you EGT's by allowing more exhaust flow from the hot side of the turbo. Both 4" and 5" kits come with a 4" downpipe so the only advantage 5" has is tone. You will get a deeper/louder sound from the 5" escially with a 5-6" or 5-7" tip on it.

2000 Regular Cab SHORTY truck.

-7.3/ZF6 combo.
-TS tuned
-5" exhaust to 7" single mitre.
-DJM 3/5 drop

-Midwest shifter
-DP tuner
-22" wheels wrapped in 305 nitto 420's

-2008 F350 CCLB ZF6 truck. Leveled, 22's w/37s, deleted, H&Stuned etc -SOLD
-2005 F350 CCLB 6" 37's, studded, tuned etc-SOLD
-2002 F350 CCLB 6"lift, 20's w/35's, DP tuner etc -SOLD
-2005 F250 CCLB 8", 20's w/37's bunch of mods -SOLD
-2002 F250 CCSB 4" lift,18's w/35's DP tunes etc -SOLD
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