A 34;GREAT TOOL34; for the serious week-end mechanic. I used this tool with Throttle Muscle TM5225 - Throttle Power Pro 2-Step Fuel System and Induction Cleaner Kit and man, did do a good job. I completed the prescribed instructions in about 45min Pouring the Throttle Power Pro Vaccum Intake Solution into the intake system cleaner container then ran the adjacent hose to my vacuum line of off my cars brake booster. Used a Thexton 393 throttle depressor tool adjusted to 500RPM as recommended and before starting the process I poured the Throttle Power Pro gas treatment into my half full gas tank. Let my car run until the S.U.R intake container was empty. followed that process up immediately with a bottle of Throttle Muscle Engine Flush and Crank Case Cleaner 128oz. Prior to completing these engine and fuel system treatments my car could not pass NJ inspection. The next day I brought my car into NJ DMV Inspection as all my previous 34;NOT READY34; monitors and P0304 engine codes were all corrected and cleared within a short drive after completing these engine described engine treatments. This tool, the time spent completing this process was worth every red cent. I highly recommend it and Throttle Muscle Engine Treatment Products to any and all serious DIYers and Professionals alike.