I am at 18psi now on my Gt4094r street ported FD with a stock clutch, and its not slipping. I dont drag race at all, but do drive aggressively at times. I have not dynoed, but estimate my power to be at least 400rwhp. Or is it that I may not be that high in power? Has anyone done 400 on stock clutch with out slippage?

 

Thats unheard of. It usually slips by 300whp.

 

are you sure it's stock? could a previous owner have installed something with more torque capacity?