i am in the process of getting a sc430. i am just wondering if changing the rims to 19 or even 20" will scratch the inner linning or compromise the ride quality?

also, what's the most reputable tuners out there that can either use chips or some other hardware to incrase the horse power output of the car?

thank you

 

Really depends on your offsets and if or how far you lower the car.

Power wise depends how much extra your looking for and how much you want to spend.

 

Well when you change the wheels and tires from stock to either 19" or 20" the ride will be Much BETTER then stock because you are getting rid of those run flat tires. If you need I can make suggestions on what wheels/tires are available based on your type of style, budget, and time line.

As for power adders, there isn't much to be done to the SC but member Pearl Power can chime in on this one. He has some experience on bolt-ons and there gains. My first thing would prob be the exhaust not for power but for sound