Hi, i purchased a wrx about a year ago. I have been easy on the mods, the only mod i have is HKS hiper exhaust. My cousin has a Nissan 300ZX twin turbo that has over 550 rwhp that runs low 11's and traps in the mid to high 120's mph (HKS ballbearing turbos, tubular manifolds, fullexhaust, intercooler, etc., stock bottom end). What do i need to do, if anything, to keep up with him? Thanks.