Key to getting the MAX from this kit is consistent MAF readings. Any positive airflow passing over the air filters will create inconsistent MAF readings with an end result of turbulence making the Z have a sputter affect when accelerating with a result sometimes into limp mode. Since I'm running the upgraded Frozen Boost heat exchanger that is not allowing me to install the "Stillen" factory deflector, I have had the Y pipe re-adjusted a few weeks ago in cutting away some of the metal where the hood latches into place and making a little deflector from an old licences plate. This really helped with more of a consistent MAF reading allowing for a much better Z response. Oh.. And of course my 9lb pulley helps with that response too!