DIY 6637 & muffler deleat = how much hp gain - Ford Powerstroke Diesel Forum
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Old 01-06-2009, 02:47 PM
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DIY 6637 & muffler deleat = how much hp gain

i have a 2000 f250 7.3 i installed a DIY napa 6637 filter and deleated the muffler and ran a stright pipe how much hp. and tq. do you think i gained.
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Old 01-06-2009, 03:04 PM
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So little than you wont even notice it. They are not really HP/TQ gain mods, but more supporting mods IMO
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Old 01-06-2009, 04:01 PM
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Yep... you won't see much gains at all... it is just a supporting mod... Sounds much better though!!
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Old 10-08-2012, 07:12 PM
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Did the 6637, but wondering how much louder the muffler delete is? Don't mind it sounding better, but don't want it much, if any, louder. Please advise...
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Old 10-08-2012, 07:51 PM
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No real power gains. Might gain a hair on mileage though, as the engine is breathing a bit easier...well once you get over how sweet that straight pipe sound!
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Old 10-09-2012, 03:41 AM
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Quote:
Originally Posted by kwerges View Post
Did the 6637, but wondering how much louder the muffler delete is? Don't mind it sounding better, but don't want it much, if any, louder. Please advise...
The muffler delete is not much louder unless you start laying the pedal to the floor. Then it gets that deep raspy sound. I thoroughly enjoy the occasional romp on the accelerator. All in all though, not much louder
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Old 10-09-2012, 04:31 AM
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I agree, not too much louder..
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Old 10-09-2012, 06:19 AM
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What I dont understand is how people think that an exhaust gives mpg, but no hp. If you have one, you must have the other.

With that being said, I cant say you got "x" hp or "xx" hp from intake/turbo back... but I can say that you are certainly gaining hp/tq if you can A.) feel the difference, and B.) Are picking up mpg.
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Old 10-09-2012, 08:21 AM
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allowing the engine to breathe allows the turbo to spool up easier and get the engine into its efficiency range sooner... that doesn't necessarily equate to an increase in power
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Old 10-09-2012, 08:44 AM
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Efficiency is energy. Proper allocation of energy results in greater outcomes (egt, hp/tq, mpg).
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