TSP KTM 300 & Husky 300 17-On (TPI) Billet Head Bundle** Please note this listing is for TPI models, for the carby models please see the carby listing as it will include the required coolant plug in the head ** Select your desired compression ratio from the drop down menu. All designs will work with stock base gaskets and cylinder heights and offer significant improvements over stock heads. LOW COMPRESSION: Roughly the same compression ratio as stock EXC or TE, much tighter squish clearance and better