well yeah... to get closer to stock like dia I would have to put 245/45 on..Those will looks really small.
yeah. which makes me think that having 9 with less offset and less tire width should run just fine. I wish I could test drive smbd's ms3 with at least 235s onudontknowjack ran 17x8's +50 with 245/45's but on BC coilovers. But he wasn't that low.
You could always just get 235/45 and be slightly shorter than the stock tires diameter.
18x9.5 +37 on stock suspension will work since there is a lot of wheel gap. But if you hit a hard bump, you'll probably rub even with rolled fenders. You'll have to pull them as much as you can.
You can do 18x9 +45 with probably a 265/35 or 275/35 tire. Could possibly need a 5mm spacer up front.