horsepower for stock wheels
 

how much horsepower/torque can the stock fd wheels/rims handle before i have to upgrade to different rims?

depends on the tires? Is this a trick question?

The stock rims are what? 16x7.5 or 16x8? You can fit 225's?

Grip with street tires =/ grip with slicks or R-compound tires so :dunno:

Are you wanting to know if they will brake? No. I dont know about the US but many people who drag race FD's here use the stock wheels with M/T drag radials because the stock wheels are lighter than most aftermarket wheels in the same price range.

If your question is pertaining to traction then all you need is better tyres.