considering a 03 b7 1.8t but wanted to know will a s4 or rs4 bumpers will fit on the car im considering

 

I imagine a B7 S4 bumper will bolt up just as it will on the B5, but that the RS4 bumpers will not due to flaring of fenderlines. The B7 may not be flared as much as the B5 RS4 (which is practically a widebody), but I think it is flared somewhat.