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Hey everyone. I just recently got new tires installed (friday afternoon), but unfortunately the guys at discount mixed up the wheels and had a rear on the front, and a front on the rear. Didn't notice anything driving it home tbh, but yesterday I drove it to work and I started feeling it...

Just got my rears replaced at discount and told them to put on the same p zeros that came with the car until the fronts wear out and I can go with another brand. It appears they put on P Zero Neros. Are these the same as the P Zeros from the factory?

After seeing positive knock on 91 gas here in AZ I decided to go the E85 route. Unfortunately my knock readings are still positive (typically around 1-2 degrees from 5k to 7k). Is this actually an issue now that I have better gas. I have checked my catback exhaust and it has zero clearance...

Anyone else here experiencing knock? I had AED tune my car but even with the stock tune I was seeing knock and I ruled out exhaust rattles. Is the gas here just piss poor?