CrossfireForum - The Chrysler Crossfire and SRT6 Resource

Hello X-fire Enthusiast, I have 2 very interesting question for you all.

1. I have an '05 SRT-6 and I just replaced my front tires. I scored a pair of Michelin Pilots Sports off E-bay with 80% treads for $160. Once they were put on they seem to have a slighty different tread than the original. I think these may be a year older version of this tire but they are definitely not A/S tires. Anyway, they're are in really good shape. Would this be detrimental to the car's performance since the treads are a lil off?

2. I'm thinking of going from 255/35/19 to 255/40/19. Would that affect the car's performance as well?

Thanks in advance for all your feebacks. ;)