I have a stage 1.5 SC GTM and make 516 rwhp 383 rwtq and it is reliable all day long , Sam at GTM told me 550 at the wheels is about the limit(since the limit varies car to car)a good number to shoot for is 500 rwhp this way you can decide which is best for you either a SC or TT.
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2013 ZL1
754 rwhp 747 rwtq 
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