Talk to the guy at InMotion -- I only did one "tune" knowing I was adding the other upgrades as I went along. It is definitley the base for all the other mod's to work their best.

If you want to save money, I did the TVT CAI without the engine cover -- just have a MB emblem on the intake manifold. Pic is in my gallery I think... You can add the cover later, but it of course does not improve performance !!!