HKS hi power silent, i want the amuse r1 thats for sale but old man doesn't like a loud car =[, its got a pfc, and it has stock cams in it at the moment. Previous owner had cams listed on ad as well, but wasn't informed what cams i was running, so could it be possible that i might have cams not suited for response or not dialed in for response? but either way, when i get new cams put in, i'll see what my old cams were, see if they were stock or aftermarket.