Stock clutch specs

I've tried to find some reference to the clamping power of the stock clutch. I was thinking of going with the Nismo Clutch kit with the JWT 14lb flywheel, but want to compare some numbers first. I know the Nismo kit is somewhere in the range of 1037kg/57kg but I've searched everywhere to find what the stock ratings are. I don't want to go more than 20% stronger clamping since it's more or less a daily driver. Does anyone have any numbers for comparison or maybe a link. Thanks! :thumbsup: