hehe the guy with the IS is my friend, he came to the shop where i work at to do the turbo, the car is stand alone and that PFS turbo kit costs 10G's! but not worth the money, the kit had all kinds of fitment problems and bad tech support from PFS but after everything got worked out the car was fast! it made 370hp to the wheels and the torque was right there too. its one of those cars that make you go holy sh!@#t as it boosts. but the sad thing is he just sold it a few weeks ago for a big loss, i think he sold it for 28k or something like that. anyway alittle side tracked, he just disconnected the vacume hose and all was fine i dont see haw removing it would hurt if not help.