Throttle Muscle TM5225 - Throttle Power Pro 2-Step Fuel System and Induction Cleaner - 1 Kit Step 1 - 6 Oz Super Concentrated Fuel System Cleaner (add to gas tank) Step 2 - 12 Oz Super Concentrated Liqud Intake Cleaner (use with installer) Cleans Fuel Injectors, intake valves and ports. Keeps combustion chamber clean. Safe for use in turbo and supercharged vehicles (NO ROTARY ENGINES!)