[ http://www.best-chemical.com/racing.htm ] agrees with Robo. I have a strong stage IV. I have been cautioned by my mechanic not to do it too much. Better Turbos would be nice but for the few times I might use them they are too pricey. You can buy toluene at Sherwin-Williams as he said. If you find a painting contractor to shill for you it is available for as little as $60 for 5 gallons. It is shelf stable. Keep a tight seal and none evaporates. The Best Chemical guy agrees with with 2 chemical engineers I know. One is a rocket scientist at Langley NASA. Toluene was used in some early liquid fueled rockets. The other works for Continental at the injector factory here.