right size exhaust - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 11-02-2012, 07:16 AM Thread Starter
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right size exhaust

got the Diamond Eye 3" down pipe, gutted the cat. Looking to upgrade my exhaust. Heard somewhere that anything over 4" cat back was useless. Plan on upgrading injectors at some point. Currently running Super Chips programmer. Should I stick with a 4" exhaust? is 5" exhaust really too much? Thanks
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post #2 of 6 Old 11-02-2012, 07:45 AM
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The 4" systems are more than enough to support most trucks. There is no real performance gain with a 5" system, just a deeper throatier sound. In the end, it's really up to you and your personal preference.

Let us know if we can help
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post #3 of 6 Old 11-02-2012, 04:12 PM
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I vote for 5", I have it and love the sound. Only downfalls of it is it is tight and have quite a bit of turbo whistle, but other than that it is awsome. 4" is fine to I just like the sound of 5".

My Truck
97' F-250HD. ECLB. 66,000 miles. 7.3. E40D. 6637 Filter. 5" Exhaust. Deleted EBPV. CCV mod. 45 gal. Transferflow Rear Tank. Stock for now. Dana 60 in the works.
My Dad's
97' F-250HD. ECLB. 18x,xxx miles. 7.3. E40D. 6637 Filter. 4" Exhaust. TW Tunes. Work Truck.
97' F-250HD. ECLB. 150,000 miles. 7.3. E40D. 4" Exhaust. Work Truck.

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post #4 of 6 Old 11-06-2012, 08:27 AM
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3" DP and 4" exhaust here. no need for 5"

1997 F-350 CC Dually Power Hungry performance chip. DIY air intake ,4" Diamond Eye exhaust, Trans temp gauge,Pyrometer gauge 10,000 Lb. Warn Winch, 1 million candle power auxilary lights,black heavy diamond plate bumper/brushguard
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post #5 of 6 Old 11-06-2012, 06:36 PM
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4 inch DP and 5 inch straight. Love it!

DP Tuner
Dieselsite Wicked Wheel II
5" Straight Pipe
6637 DIY Intake
Riffraff Intercooler Boots
Riffraff CCV
Harley Davidson Headlights Conversion
05-07 Grille
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Line of Fire
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post #6 of 6 Old 11-06-2012, 06:37 PM
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I think 5 inch will lower exhaust temperature better than 4 inch but I'm not sure.

DP Tuner
Dieselsite Wicked Wheel II
5" Straight Pipe
6637 DIY Intake
Riffraff Intercooler Boots
Riffraff CCV
Harley Davidson Headlights Conversion
05-07 Grille
2.5 Leveling Kit
33" BFGoodrich All Terrain
LED tail lights
Billet Grille
Line of Fire
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