94' 7.3l Muffler question - Ford Powerstroke Diesel Forum
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Old 12-26-2007, 08:39 PM
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Cool 94' 7.3l Muffler question

Hi I have a 7.3L:ford diesel which I am looking to change the stock muffler. I am looking for a muffler which offers the most power and sound . Yes I can't hear the motor like I could with my Dodge Cummins. So can you offer some mufflers to look at which offer both?

Thanks!
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Old 12-26-2007, 08:40 PM
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i got a muffler for ya STRAIGHT PIPE!!!!!!!!!
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Old 12-26-2007, 08:51 PM
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Straght pipe EXTRA POWER. or a flowmaster 40 series
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Old 12-26-2007, 08:52 PM
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a system is going to give u more power but it cost lots more too. if u just want a awesome sound and a little more push then straight pipe it but if u got a little extra dough i would get a system and talk to farmboydiesel he gives a hell of a deal on exhaust!!!
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Old 12-30-2007, 01:00 AM
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The muffler is not the restriction in the OBS exhaust system. The downpipe, cat and the Exhaust backpressure valve are. Gut the EBPV, install a downpipe and remove the cat. I pulled 408 hp through the stock muffler and 14.5 quarter times. When I installed a 4" dual with 4" in/out muffler the exhaust sound was about the same. The factory muffler on an OBS is a fairly good straight through design just like a big Donaldson muffler.
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Old 12-30-2007, 10:24 AM
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Quote:
Originally Posted by masami View Post
The muffler is not the restriction in the OBS exhaust system. The downpipe, cat and the Exhaust backpressure valve are. Gut the EBPV, install a downpipe and remove the cat. I pulled 408 hp through the stock muffler and 14.5 quarter times. When I installed a 4" dual with 4" in/out muffler the exhaust sound was about the same. The factory muffler on an OBS is a fairly good straight through design just like a big Donaldson muffler.
I agree
If you want more flow then the stock muffler allows then you would do better to save up and increase the pipe size all the way out. About all you will get from just a muffler delete is a sound change, not much of a flow difference at all. The bad restrictions are #1 down pipe, #2 cat, and a some what distant 3rd is the EBPV. For me the EBPV is well worth keeping for worm up time and a bit of exhaust braking.
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Old 12-31-2007, 04:07 AM
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The way to go on the cheap is a 3" to 3-1/2" downpipe and a section of 3-1/2" pipe to the muffler in place of the cat. Dale Isley of Tymarperformance is a source for this downpipe and the Tymar air intake. 509-922-TRUK. He's also a great resource for knowledge of all things Powerstroke.
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