hi i've got 17" chrome lexus wheels 99gs400. 245/45/17 michelin pilot sport a/s tires. i'm considering putting H&R spacers on. i read where someone did 25mm on rear with same setup i have and liked it, but i haven't seen anyone say anything about the front. i'm thinking about doing a 15mm in front. also wondering if a 25mm would work in front? does anyone have any opinions on any of this? what happens if or when i put 16"wheels on for winter? thanks ivan