Well my first indication was my wideband taking a shit. The second indication was the car no longer idling right. After extensive trouble shooting, figured it out once I took my car to Greg at RET to tune the car, since I figured my car needed to be further tuned to fix the idle problem. Sure enough one O2 was completely dead, and the other was on life support. I have the rear O2 turned off. I have been running good old 100 unleaded in my car for 8000 plus miles. Half my cars entire life. I am always interested though in finding new options for race gas. The MS 109 is just too big a pain in the ass and its expensive, which is why I chose to tune for 100. It works fine with my Whipple at 22 lbs.
