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dont listen to these foo's. Anyone can turn a GSX or GST into 400 hp it takes a true tuner to make a 420a that fast. Im in the process of building my GS motor with basically the same setup as your going with. Im currently running a Hahn STage 2 on the stock motor and it's roughly 240hp. After the build I'll be right around 400. Welcome to the site if you have any questions or anything feel free to PM me. Good luck with everything
Jim
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