I just picked up a set of Firestone Firehawk SZ50 P255/50R16 tires for the back of my Formula. They are the stickiest tires I've ever had. My old Kumho 245/50r16's would light them up and squeal like hell when shifting from first to second. I had a Frost tune and the transmission line pressure was boosted very high. The shift was VERY hard and even under half throttle it would chirp the tires. These don't make a sound. They just grab! I can't even spin them off the line. They just launch really hard! I love it but will miss the burnout sound...That's ok...Acceleration over sound is a good thing. The only problem I have is finding another pair for the front. They are impossible to find. Tire Rack doesn't carry them. Hell...Firestone doesn't even carry them anymore. Anybody out there have an suggestions or any for sale?? Thanks!