My tire set up is 305/30/20 on a 20 x 10.5
wheel they do scrape at times. I didn't like the profile of the 285's probably because it was a 35 series tire instead of a 30. I don't think my car is under powdered, but I've never had traction issues, I just floor it and it goes. Even in manual mode I only been beaten off the line by a Audi s4 by a car, before realing him in ,dead even with a Telsa shock us both. This is on the street not a track. Stop light war. I purchased the 60 hp chip that only gives you 40 hp , red flag but I was desperate for any power increase, I couldn't tell any hp difference maybe a little mpg difference. So when my wife drove the car and didn't say anything I called chip your car and told them, I don't think it works ,they told me another way over the phone to get it to work. I convinced myself that I had more power, because my butt dyno never lies ,( yeah right ) So my trans tune was bad from the start wouldn't go to 7k rpm sent it back,installed the new TCU drove it a week, was looking on line about if chips really worked found out that mine was a scam. So I took it out and tried to start the car, got the extended crank like the car wasn't getting fuel. Put it back because I've never had that issue ,so I'm keeping the chip in.