**Professional install is highly recommended. Ring gaps must be set, and base gaskets must be installed properly. Setup sheet is included. The DH Motoring Stage 3 Package includes the following: DHM ECU Flash DHM High Compression Stock Bore Piston DHM S1 Camshaft NGK CR9E Spark Plug Combined with your aftermarket intake and exhaust, this is the most you can get out of your Grom without doing any head work. After dyno testing we were repeatedly seeing 13hp at the wheels (SAE) run after run! The Stage 3 package makes more power than a stock Grom at every RPM and double the horsepower at 9000+ rpm! 91 octane fuel is absolutely required. Any fuel with a lower octane rating may result in engine damage! You can choose to receive a preflashed ECU instead of sending yours in or you can send yours in to be flashed. An oil cooler and extra crankcase vents are required for this kit to operate reliably. We offer the following crankcase vent systems:AvailMS Crankcase Vent MO Power Crankcase Cover Oil Cooler Kits: Kitaco x DHM Oil Cooler Kit Drow x DHM Oil Cooler Kit
