Your rev limiter is there for a reason, leave it alone unless you engine has been worked to utilize more engine revolution. For that you need better internals and bearings
been using it for more than a year now... Trust me when i say.. u don't need it really... You will get bored of it after a few days.. It won't fark your engine, it usually depends on how often and how hard you use it.. If u set Gain to F and at low rpm's.. then you are asking for trouble..
I would like to ask ur pros out thr..I would like to get a skyline..R34 has been my dream car for past 10years..but it seems hard to get original Gtr cuz all in market is Gtt..i spend nearly 6month...