Running no muffler - Ford Powerstroke Diesel Forum
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  #1  
Old 12-19-2012, 05:43 PM
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Running no muffler

So i was thinking about just removing the muffler leaving the cat on. Will this help my truck at all or does the turbo need back pressure? Some guys say your mpg will go down but its probably them just laying in to the truck for the sound so what do you guys think?
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Old 12-19-2012, 05:46 PM
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The turbo supply's back pressure on a diesels the faster u can get it out the better
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Old 12-20-2012, 06:17 AM
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I've heard that too--that running a straight pipe will reduce MPGs. Can anyone verify if that's true and why?
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Old 12-20-2012, 06:24 AM
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I heard it was that theres no back pressure
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Old 12-20-2012, 07:06 AM
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That is all false, a straight pipe on a turbo is a good thing. The turbo itself provides all the back pressure the motor needs. A straight pipe will not hurt mpgs, if anything it should help some because the turbo can move air more efficiently.

My RAZR made me send this...
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Old 12-20-2012, 11:26 AM
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The muffler isn't that restrictive compared to the cat, so all you're going to gain is some upset neighbors.
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Old 12-20-2012, 11:30 AM
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Quote:
Originally Posted by bwmtnbiker View Post
That is all false, a straight pipe on a turbo is a good thing. The turbo itself provides all the back pressure the motor needs. A straight pipe will not hurt mpgs, if anything it should help some because the turbo can move air more efficiently.

My RAZR made me send this...
This is the conclusion that I came to. I dont know if my mpg's got better when I swapped the exhaust since I was also on a new motor.
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Old 12-20-2012, 11:42 AM
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When i put my 4in turbo back magnaflow system on W/O cat but have muffler which is strait thru I gained better than a 1 mpg.
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Old 12-20-2012, 12:05 PM
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Ask yourself this;

1. What are my mpg's currently?
2. If they dropped 1-2 mpg's, would I lose sleep at night?
3. What if I did gain mpg's?

Just try it. If you don't like the performance or the sound, put it back on. Just my
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  #10  
Old 12-20-2012, 01:38 PM
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no mpg loss and just removing the muffler won't be real loud at all my favorite sounding exhaust is muffler and cat delete on factory exhaust you still have a resonator pre cat
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