Originally Posted by My370zSport

Not all are equal, just go with a well known brand and if you aren't tracking the car, the bolt-on type will work great. I have zero vibration, the car feels rock solid as ever. I spoke to Z1 Motorsports for a while on the best setup for my car (sport model with the 19" Rays and staggered stance 245/275).

I love the track tuned suspension and forged wheels, so since I won't be changing either, we went with 20mm up front and 20mm in the back. I see where some go as far as 25mm in the rear, but I'd like to possibly go to a 285 or 305 in the back later and that would definitely push it (don't want to roll the fenders or scrub).

The possibility of getting some paint chips from the more aggressive stance is there, but well worth it IMO. I never take it on the interstate and keep my distance from other cars. Dr. Color Chip does an excellent job on repairing the occasional chip though when it does happen =)