Hi guys, just a simple question on the difference tire sizing. I have a 03 Z and i need to change the tires. The stock size are 225/50/17 & 235/50/17. I can only find two brands at tirerack with this sizes, the oem bridgestone and michellin pilots. You think i can go 1 series lower like the 45 series? Is this ok or will it affect the performance/driving? It's so hard to find the 50 series in 17's.