7.3 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 05-03-2010, 11:36 AM
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7.3 idi exhaust

I have a 90 f250 7.3 idi and was wondering wut i should do for exhaust? i wanna straight pipe it but how does it sound good or bad would it hurt the engine since its non turbo?
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Old 05-03-2010, 11:39 AM
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I believe you will have to have some type of restriction as far as mufflers go because as you know there is no turbo to create backpressure on the motor.
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Old 05-03-2010, 11:41 AM
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Tht is what i was thinking but i just didnt know im used to having turboed 7.3s lol
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Old 05-04-2010, 04:31 AM
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i got mine strait piped with 2 5in stacks sounds great and it runs the same when it had mufflers.
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Old 05-04-2010, 06:34 AM
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There is a guy on youtube that has 3" exhaust with glass packs on his idi 7.3 I love the way it sounds but some may not. The audio gets a little distorted when he revs it. The truck is gorgeous though
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Old 05-15-2010, 01:35 PM
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It will be way too loud without a turbo. Not bad for the engine but you will want to wear ear plugs.

Dont go over 3 or so inches or its just rediculous. Plus on those engines its not going to gain you any power.

Thad
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Old 05-17-2010, 06:18 AM
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i thought the same thing but mine is pretty quite for having 5in stacks. it was louder when it was 2.5 in strait piped.
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Old 05-17-2010, 11:28 AM
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Is your turbo'ed?
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Old 05-17-2010, 08:29 PM
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nope but i hope to get one
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Old 05-18-2010, 12:48 AM
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Thats the single best thing I EVER did to my IDI!!!!

Thad
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