dont buy that, its bs. and a real piggyback is around 500$ which should be able to advance some timing, and fuel ratios. generic tuning will never be better than a custom dyno tuned map, done by a professional tuner. from what i understand, i believe you want 12.5 afr on a naturally aspirated application, and 11-11.5 on boost for best power at WOT. you can always go standalone which is even more money, but then you get to play around with the closed loop which is around 0-3500rpm on our cars.
http://roadraceengineering.com/4g/te...tuningtips.pdf <--- interesting read.