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Hey, thanks for the responses guys. I guess Ill do a little more research on the exhaust thing,Ive heard people say the engines need the back pressure and also the muffler acts as a crossover and all so Ill post any findings on here for future reference as I am a member of a ford truck forum as...

OK...I have an '04 Tahoe with true duels all the way back(two Flowmaster mufflers),OK..my question is will I get better performance by running one muffler(2in and 2 out)? I have a K&N air filter and Ive been running synthetic oil for a long time now. Im not really happy with the way it sounds...