EXHAST SIZE 4" or 5" - 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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post #1 of 15 Old 01-29-2008, 09:33 AM Thread Starter
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EXHAST SIZE 4" or 5"

Can any one tell me if it will hurt me to go with 2 1/4" off the manifolds in to a single 5" pipe to the back on my 1992
non turbo 7.3
thanks Scott


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1992 F250 Super Cab 4x4 5speed non-turbo
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post #2 of 15 Old 02-06-2008, 05:51 PM
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You don't need 5", especially non-turbo'd. Even with a blower, 4" won't give any significant back pressure. Yours is a long wheel base - why not straight pipe it? It's no louder than with the muffler, one more restriction you don't need.
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post #3 of 15 Old 02-18-2008, 08:55 PM
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Quote:
Originally Posted by JETT View Post
Can any one tell me if it will hurt me to go with 2 1/4" off the manifolds in to a single 5" pipe to the back on my 1992
non turbo 7.3
thanks Scott
Your Best off running 3" pipe from the Y pipe back the manifolds back. 3" pipes are what comes with all three after market turbo kits and has been the standard for the Past 20 years as the upgraded exhaust pipe for the IDI's. If you want to have a 4" pipe, just run 4" from the muffler back it look big at the tail pipe and sound louder too. IDI motor's just don't blow that much to need 4" or 5" even with turbos. 3" pipe with a Flowmaster or a glass pack with 3" inlet and outlet will work great. If you have a turbo on your motor just run Strait 3" all the way, you'll love the sound.

Most Powerstroke guys are running 4" and that fill the needs of many. 5" is great for 600 hp plus motors witch is more power then an IDI will ever make.


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post #4 of 15 Old 02-18-2008, 09:51 PM
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dont know about the 600 hp comment building my idi non turbo and have it done in about 2 months and we are projecting 800 hp as a hot street
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post #5 of 15 Old 02-27-2008, 02:49 PM
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highly doubtful, we need more info on this

01 F350 Regular Cab, Long bed
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post #6 of 15 Old 02-27-2008, 05:38 PM
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dont know about the 600 hp comment building my idi non turbo and have it done in about 2 months and we are projecting 800 hp as a hot street
WoW! Thats alot power for a N/A IDI. How do plan on doing that?


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post #7 of 15 Old 02-27-2008, 06:31 PM
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intercooled turboed cut injectors built pump and go from there letting my buddy that owns his shop mess around with it for a couple of months.
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post #8 of 15 Old 02-27-2008, 08:24 PM
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LOL.........

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post #9 of 15 Old 02-27-2008, 09:23 PM
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Yeah..800HP.... that uh... seems highly not feasible.
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post #10 of 15 Old 02-27-2008, 09:43 PM
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sry guys didnt see that i put 800 i meant 500 my mistake i know that theres no way in hell to get 800 maybe not even 500 but im going to try sry
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