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Discussion Starter #1
My question is what is the difference in having a local exhaust shop do a straight pipe cat back exhaust compared to one such as MBRP. I can have one done for less than half the cost of the MBRP. Is there going to be much difference in performance, sound, etc. by going this route?
 

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if you have a place that can bend 4 inch pipe, i say go for it!
 

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caz41,

Exactly, finding a place that can mandrel bend 4 inch is doubtful. The flow rate between 3.5 and 4.0 especially when you add the mabdrel bending in is a large percentage, one of our engineer types will probably be able to quote you the difference, but it always amazes me that 1/2 inch makes such a large difference.

Then there is the straight pipe sound, some like it others don't, the MBRP has a muscle car growl due to the muffler so that might be important to you as well. If you have any questions feel free to call us.

Mark @ DPPI
 

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Discussion Starter #4
I was looking at the MBRP with the muffler delete pipe, but then found that out about this other option. I didn't know if anything would be different or not. Some people say that one exhaust is louder/quieter than another, I assume that is the muffler that creates the various sounds, and all straight pipes would be fairly similar no matter who makes them?
 

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If your set on doing it your self or having a shop do it in four inch it can be done. You have to route the pipe down under the x member, it can't just be straight. You could buy some 45 and 90 degree bends at most any truck chrome shop. It'll be pretty hacked up and pieced together. the amount of labor involved to build one (manderal bent 4" sys) will probably cost more than most 4" kits out there.
 

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there is a huge difference in pipe size, the stock Duramax exhaust is 3 1/2" in diameter. MBRP is 4". if you do the math on area size, the area of a 4" pipe is 30% larger than the stock 31/2 pipe. I also know the bending is very important.
 
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