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Only reason I opted for solid diff/subframe bushings was due to my installer saying I could basically "do it once and never worry about it again" or constantly be bother by the squeakiness of poly bushings or the eventual failure again from using OEM ones. I actually don't mind the NVH or the little additional road noise whine from them. But to each their own...
Yes, +15 with no mods to fit. Keep in mind, I'm on stock suspension, so when I go lower, I'll need to roll the rear fenders. I probably could go bigger on the sidewall, but this setup was recommended by Russ at Z1, who initially hooked me up with the wheels/tires combo. I think the compound is slightly different on the 40's. I also go down to 30 psi on track days - these tires perform great. No rubbing, and terrific grip, I removed a fender liner screw, as it could rub against that. But as far as everything else is concerned, go for it.
I've also done a 18x10.5 +15 RPF1 (275/35ZR-18 MICHELIN PILOT SPORT 4S) on all 4 with stock suspension (for grip naturally!). On my Zed, even with quite a bit of camber, the rears touched the fenders when compressed far enough. You can test this by removing the front and rear suspension and pushing the wheel up into the fender. I rolled the rear fenders, but was unsure what to do up front since the fenders are already rolled from the factory. At full compression the fronts didn't rub, but if you turned the wheels they would. I settled on removing the fender clips (red arrow) bending the fender tab back by hand and using a zip tie in place of the fender clip. So far it's worked! I saw a photo someone took of me an autocross that showed the outside wheel at full tilt and it's really close to the fender, but no rubbing as far as I can tell.
