For a gsr motor that is going to run on 93 octane I wouldn't run a stock motor past 300whp. On race gas big numbers are possible but you are one bit of detonation away from losing it.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.