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 ..hope this helpsHow 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 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.what's the difference between cat back and turbo back?
I was wondering if you had installed the cat back yet? I'm thinking of the same system for TOWING EGT reduction, but, I really don't care for any extra or obnoxious noise.