J's +35mm front fenders with 255/40/17 10" +38 with lower offset ball joints pushing wheel spec outbound about another 10-12mm

Rear CG fenders +75mm with 315/35/17 11.5" +33.

These are the same custom widened RPF1 that I ran on previous s2k without over fenders. Available tire selection that fit in rear became an issue so went wide body and added 20Fmm/30Rmm spacers to get a better flush fitment.

There is a before/after widbody wheel spec shot here in my sig on track and in lot.
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Awesome thank you. That's good information there. So did you go really wide with the wheels and fenders for traction on the track or more for the stance?

 

Well if I went for the stance id be stretching some 215's on these babies

 

Good point!

 

If you really don't want to run rear over fenders then run a 11" +65 offset wheel with 295/30/18 tires. This is the max you can fit in the rear with standard roll and tab relocate mod. Depending on your ride height and camber settings you could have slight rubbing on the inside or outside, so you will want to keep tabs on this and may need to adjust a bit after the fact.

This wheel and tire fitment will not fit on stock modded front fenders so plan on running a stagger. Its actually too large a fitment for 90% of the aftermarket wider fenders out there. Problem is inner rubbing to clear the outside fender. Most aftermarket wider fenders are fiberglass and will crack if you make contact so there really isn't any fudge area. 10.5" rim with a 285 would be pushing it on my +35 J's fenders. Add in brake ducting/hose like I have and you have even less inner room. Problem is you have to consider steering angle when factoring in fitment up front.

Added tid bit to consider. You can gain about 20mm up front by rolling the stock fender and pulling it a bit. When you go from that to a typical/semi aggressive 35mm aftermarket fender like mine, your only really gaining an honest 15mm from what you ran before. Same in the rear, I gained about 50mm actual with my +75mm over fenders because I was already utilizing the full amount I could get out of stock/modded fenders.