If you set the rev limiter to 6000 rpm and keep it at 450 or so RWHP the stock bottom end should hold up just fine. As long as your not out there beating the crap out of the motor every chance you get !!!
The Roush TVS 2300 phase one would be a good starting point for a stock motor its rated at 475 flywheel HP that should make 420 or so RWHP and be pretty safe to bolt on your car and Brenspeed has up grade kits to turn it up when your ready
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