Ricky, I am partial to NOS Octane booster, although it is more expensive ($11.00 per 12-oz can) than STP or Gunk. All are suitable for our cars but steer away from products that contain alcohol. I read they promote corrosion in the fuel system because they are hygroscopic.

So you changed wiring harness too eh? Blasted biodegradable wiring harness... I paid 41,700 for mine.

Make sure your octane boost is unleaded. The leaded fuels will destroy your engine. Just use the 91 that comes out of the pump. Remember our cars are designed with 91. The more octane the slower the burn but higher knock protection. So unless you are supercharged or heavily tuned out just use the fuel that comes out of the pump.