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No.. usually you only start having code problems if you remove the cat in a turbo back system. :rolleyes:



 

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On my '02 DMax I removed the cat when I put my 4" exhaust in. I never had a problem with codes. It ran very well but was unusually loud in the cab. Even with my performance chip (VanAiken) and K&N, I didn't get a code. Maybe I was lucky.
 

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i use the RBP cat back and use no muffler and hace never thrown a code
 

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How do you like the '06? What were some changes to your truck from the '02 I drive?

Is that straight pipe loud in the cab? With my muffler, I always had the stereo on to drown it out. I heard that Banks makes a performance muffler but its quiet. On long trips the noise was difficult.
 

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How do you like the '06? What were some changes to your truck from the '02 I drive?

Is that straight pipe loud in the cab? With my muffler, I always had the stereo on to drown it out. I heard that Banks makes a performance muffler but its quiet. On long trips the noise was difficult.
the newer LBZ and LMM Duramax diesels are quieter then the earlier LLY and LB7...i have a 5"T/B exhaust on my 06 LBZ and it is quiter then my 05 LLY with a dual 4"T/B exhaust runnin at highway speeds but that changes when they are under throttle,under throttle that 5" can be heard up to a 1/2 mile away and i've proved that:D ..hope this helps
 

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I have a MBRP cool duals cat back on my 07 LBZ and i dont trow coeds. Only when you put a turbo back on it iwll throw coeds
 

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I read some tests that compared both systems and according to a graph, there wasn't much difference power wise. If you have pollution laws regarding diesels in your state, i'd leave the cat hooked up and go cat back w/the exhaust. A 4" pipe all the way out with a good muffler will lower the temps easily.
 

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what's the difference between cat back and turbo back?
The cat back consits of a muffler and tail pipe that goes from the catalitic converter to the end of the truck. The downpipe back goes from the motor to the end of the truck and has a pipe to eliminate the cat then the muffler and tail pipe. :cool:

Turbo back.... Straight pipe


Turbo back.... Wheres the Kitty?




 

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From feedback we've heard of people with turbo back systems, you stand a 50/50 chance of throwing a code once the cats gone. The cat is part of the emission controls on a stock truck so that's why the truck will throw a code when it's removed.
 
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