You make it seem like every single thing about the XS kit is bad which is false. From what XS Turbo kit owners have posted, some have experienced customer service problems. One incident was about a Turbo manifold that was warped/cracked/damaged and XS wouldn't replace it. Other kits have worked just fine. The kit utilizes the apexi power fc engine management/ecu.
Bottom line: It is a good kit but the customer service backing it isn't up to par from what I understand.
you have a very good point, but i belive stefanoc was trying to say that XS is not reliable, because of the past feedbacks on them, that goes on the reputation, SF gives more gains and i dont belive any one has complained about it, but its all up to you dawg, get wat you think its best for you, and a bout the trany, i heard GTS trannys are bad, i just had mine replaced under waranty, synchos were fucked up, so be careful, and if you really dont wanna worry about trany problems, check out C2Gas trany, its pretty muchs the best build tranny for our cars, and they make Turbos for our cars 2 so check him out
hope this help