I have the GTM supercharger. I got 430whp/340tq. THere are people like RCZ that have had success with the stillen supercharger, but also some that have had problems. I would do more research on this very forum on the 2 and then ask more questions after you done a few days to weeks of reading on here, and be wary of questions b/c it can get out of hand quickly on here.
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2010 MW G37 Convertible 6MT
Stage I GTM supercharger
GTM oil cooler with thermastat
430whp / 340tq
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