K&N offers two different cold air intakes for my 2005 LT with a Vortec 4.2L I6. One option is polished aluminum (77-3036) and the other is a black plastic material (55-3036). Which one is the best for my Trailblazer to reach better horsepower and sound? (with a later resonator delete and Y-Piped...

Which one of those two company's has best performance and is the loudest ?

I've search thru a lot of the cai threads but didn't have any luck.i installed the K&N 77 CAI but the instructions say to cut the 1 1/4in. hole IF my vehicle has air injection and i don't know if my 2002 LS trailblazer does or not.in the threads i found about the air injection it looks like the...

So last week i cut off the Resonater, Hallowed out my Air Box and put in a K&N air filter in, Couldnt be happier with those decisions... And today i Finished the job. I bought a Flowmaster Super44 3" inlet and outlets, Welded the stock 2.75" inside of the muffler, and WOW the sound is so much...