there's an ongoing battle about VCT among zx2 owners (we have VCT, but on exhaust cam). The cam itself is actually a different length and for the gains that can be seen, not huge. Some is lost at bottom end and only a few are gained at close to peak RPM range. This is all stuff i've heard, but all-n-all, not worth the effort. (I realize intake cam changes are usually bigger results, but still a lot of work for little response back) It IS possible though.