I'm finally looking at doing some "upgrades" to the 2500. Ok, so far I have a Airaid cold air intake, magnaflow high flow cats, flowmaster 40 series mufflers, magnaflow 4" echo tips, and have 3 1/2" exhaust pipe from my manifolds back, and of course it is true duals. I've been doing alot of reading and saw a lot of people are putting LS2 intake and throttle body on their LQ4's. The only thing I haven't been able to find is, is anybody actually noticing a difference? Any input would be appreciated

 

I would like the same thing your doing to my 2005 Silverado 2500HD I just bought the truck and looking to do what your doing wanted to let you know mine is now stock but I been using a Jet programmer for years and that so far has helped me alot so would like to stay in touch with you I also know a bit about engines and a fabricator with a full machine shop so if we need something made I can make two if needed..do you like the sound on your exhaust I wanted to go with the 40 series muffler and same cold air did it help so far ..thanks Eric