I'm looking to install some high performance larger diameter exhaust headers on my 1999 ML430. I have a Kleemann kompressor already and I'm looking into getting their prototype headers for my vehicle but out of curiosity I wonder if there are other off-the-shelf options available out there? I checked out Borla and their site has nothing. Has anyone done this mod? Also, What are your recommendations regarding high flow cats or upgraded resonators to reduce vibration in the cabin? I have the supersprint muffler and quad tail pipes and I'm fine with a louder set up to get the most horses I can get.