Mr. Turtles

Yes, its my understanding from other posts I've seen that it can be fitted on the GT3, with a little cutting here and there. The CUP lip is under $200 so a pretty minor cost. The edges will stick out and may look a little funny to some but at this point I'm not prepared to replace the whole front with a CUP front end which some have done and looks great. I never found understeer to be a problem and don't want to drill holes in the car to add the canards which as others have mentioned will add very little downforce to the front. Getting a larger/lower front lip should increase front downforce by reducing the amount of air getting under the car.

PS the biggest thing you can do to improve performance is use the best possible rubber. 19s will fit which allows for more tire selection at a lower cost.