Will 18x9 fit on the front?

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Originally Posted by Kroggers

Interesting. I am currently running 18x8.5 and 18x10 with Michelin Pilot Sport Cup 225/40 & 265/35.

The car is a dedicated racing car 2001 Boxster S which has been remapped. I will have to dyno the car again, but hope to be close to 300BHP. I am also running with a 2.5 5 speed gearbox with an LSD for better gearing.

Like I said above, I will be putting on the AIR Boxster rear fender flares which gives an extra 2" so could maybe even go up to a 18X11.5 or 18x12 rear wheel. I would have liked to get the current 18x10 that I am running in the rear to fit in the front as then I will only need to get new rear wheels

Unless you are running a 3.6L or turbo you are probably nowhere near 300rwhp. Get it on a true dyno so you know what you are working with. Oversized wheels can work well in AX but slow you down on large tracks. Too much unsprung, rotational weight and straight line rolling resistance. The fastest Boxsters in SoCal are running 245/275 tires.