Duramax Diesels Forum Truck of the Week
  #1  
Old 10-20-2010, 03:47 PM
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Default straight pipe or muffler

I am buying an exaust, i have been looking at the mbrp exhaust sysyems, getting a turbo down pipe and full turbo back system. Is it better for a dmax to get a 4" or 5" exhaust and then is it better to straight pipe it or get the muffler with it. I have heard that it needs backpressure and i have heard that it doesnt need backpressure to run better. What do u guys think, 4" or 5"? and muffler or straight pipe?..thanks
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  #2  
Old 10-20-2010, 03:48 PM
lotsofmiles lotsofmiles is offline
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straight pipe it!!!!!
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Old 10-20-2010, 03:54 PM
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Straight pipe 4" from the downpipe back.
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Old 10-20-2010, 03:58 PM
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X3 Moved here
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Old 10-20-2010, 05:02 PM
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4" straight pipe
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Old 10-20-2010, 05:09 PM
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If it's a Lly or newer straight pipe it with 4" and if it's older lb7 throw a muffler on her
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Old 10-20-2010, 07:00 PM
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I've always had a straight pipe 5" on my truck, and I always thought it sounded good. I have also had twins on my truck for the past 20k miles, and I just recently put a stock motor back on with a single stock turbo. After going back to a single, the exhaust sounded kind of loud cruising at 70 MPH (the extra turbo on the twins acts as a muffler). I threw a muffler on it, and I think it sounds a lot better. It is still loud when I get on it, but it kind of toned it down under cruising conditions. Sounds a little more mellow to me too.
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Old 10-20-2010, 07:23 PM
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Straight
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  #9  
Old 10-20-2010, 07:44 PM
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4" donaldson
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  #10  
Old 10-20-2010, 08:01 PM
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Quote:
Originally Posted by TeaBagger2006 View Post
If it's a Lly or newer straight pipe it with 4" and if it's older lb7 throw a muffler on her
Why??

I will say if you go to a larger turbo your going to want a muffler. After putting my S464 on, I had to install a muffler as it was way to gay-sounded like a set of blue bottles on an '85 Ford farm truck!!
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  #11  
Old 10-21-2010, 03:25 PM
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Straight
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  #12  
Old 10-21-2010, 03:55 PM
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I have a 5 inch straight on an LLY. I would go with straight pipe with either 4 or 5 inch. I think the 5 inch gives a deeper tone to the exhaust, but that might just be my opinion.
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  #13  
Old 10-21-2010, 06:07 PM
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Default

thanks guys..its a 2007 new body style, i want it loud but dont want it so loud that it gets on my nerves cruising down the road and i will prolly stay with stock everything.. all im going for is intake, exhaust, chip, lift, wheels and tires, whats a good intake for it?
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