Couple people have tried to reach 500 with the stillen kit. and they have failed. To much of a hassle. Go with the GTM stage 2 if you want a SC with 500.
I personally wouldnt go to the dealership for anything unless it's to fix something under warrenty. Many shops in your area have probably installed many SC/TT kits on a Z and you might be the guinea pig for youe dealership. No matter what the cost is i'd go with the shop that has more credibility and experience with the Z. So do your homework. A install and a tune is a differance between a blown engine or a long lasting engine.
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 Litespeed Racing Titanium Cold Air intake// GT Haus Axle// GarageLine combo// Nismo sway bars// Nismo Spoiler // Berk TP's
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