IDI exhaust - Ford Powerstroke Diesel Forum
7.3L IDI (Non-Powerstroke) Diesels Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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  #1  
Old 10-02-2010, 04:29 PM
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IDI exhaust

I was thinking about putting an exhaust on my 1990 7.3 IDI. I was thinking a dual 4in straight pipes to 6in tips. Would this cause any problems?
Thanks, Austin
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Old 10-03-2010, 12:42 PM
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Anybody got an opinion?
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Old 10-03-2010, 12:51 PM
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It should sound good
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Old 10-03-2010, 02:25 PM
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Quote:
Originally Posted by powerjokin 6.0 View Post
It should sound good
Thats what I was thinking. Hoping its slightly obnoxious.
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Old 10-03-2010, 03:35 PM
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Are you doing duals out the back or off the the side? I want to roll coal on people behind me lol
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Old 10-03-2010, 03:44 PM
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True duals or single back to duals?
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Old 10-03-2010, 06:30 PM
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I'm planning on true duals out the back.
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Old 10-03-2010, 06:54 PM
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4" pipe is expensive.

I would just suffer and save for a turbo.
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Old 10-03-2010, 06:58 PM
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OB has an add for an 088 (non gated) ATS turbo kit complete for 750 plus shipping.
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Old 10-03-2010, 07:11 PM
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Since its naturally aspirated, you aren't going to want to run 4". Especially if you do true duals. Your exhaust velocity is going to be very low and cause you to lose power in the lower RPM range. I would do maybe 3". And you are going to want a crossover in the pipe somewhere. You want the 2 banks to come together to help flow and scavenging. Whether that being just an x pipe or running the 2 together then splitting them right before the axle.
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