4" vs stock - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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Old 08-10-2008, 12:36 PM
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4" vs stock

I currently have NO muffler or cat, just a strait pipe that stops at my cab. Im looking at gettin the farmboydiesel 4" TB and installing myself. $330.00 shipped. Will the turbo back make a noticable difference in sound or performance even mileage versus what I already have?
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Old 08-10-2008, 12:54 PM
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You might get less drone in the cab having it exit at the bed.
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Old 08-10-2008, 01:09 PM
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Other than that will it my engine mechanically in any way?
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Old 08-10-2008, 01:10 PM
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less drone, and probably not quite as much rasp. Probably would help performance too. Turbos dont need back pressure, but a length of pipe to scavenge the air will probably help your EGTs a little.
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Old 08-10-2008, 03:08 PM
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I thought the longer the pipe the more area for EG's to collect and heat up. Is this incorrect? I was under the impression that less pipe=lower EGT's
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Old 08-10-2008, 08:05 PM
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Bigger pipe = lower EGT...

and that short pipe is making a sooty mess under your truck
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Old 08-10-2008, 08:15 PM
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Yea x2 (or 3) on the bigger pipe=lower EGTs. It will probably sound a bit better as well I would think.
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Old 08-10-2008, 08:28 PM
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i just dont c it beeing any louder
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Old 08-11-2008, 02:26 PM
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For a couple years I drove my truck with cat & muffler delete pipes. Well I found a 4" Hog down pipe for super cheap and decided it was time to do a real exhaust. I did the 4" downpipe, then a short piece of pipe into a MBRP stack.

Totally different sound with 4" piping. Much deeper tone, and the turbo whistle is more audible. What really suprised me was the EGT drop, I was thinking 50 degrees or so... I was wrong!! I could easily hit 1450 to 1500 on short WOT burst (Innovative extreme street), new exhaust = 1250 to 1320 under same conditions. Even though I had straigh through exhaust, the larger piping really lowered EGT.
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Old 08-11-2008, 06:27 PM
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best advice yet crawfish, thats what I was looking for. My decision is made
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