from the reading i have done, you have about the same chance of winning the lottery as to getting something from GTM. if you're looking for 390whp then your best bet is a supercharger. they make low to mid 400s. if you want higher then go turbo.
if money is no concern, i'd go turbo. i think there are plenty of people on here who have 500+ whp and have reliable cars that are done right.
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2 plus 2 times 2 = ? ... hint, it's not 8 
Stillen CBE, Stillen Gen 3, TP's, Uprev tuned - 324whp/264tq
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