Modquad Billet High-Performance Head Upgrade cooling and performance with the Modquad Billet High-Performance Head — a precision-machined billet aluminum replacement designed for superior heat management, durability, and fitment. Optimized flow-thru design: Engineered passages maximize coolant circulation for improved thermal control and reduced hotspotting. Increased coolant capacity: The flow-thru architecture increases coolant volume to help maintain stable operating temperatures under heavy use. Direct bolt-on fit: Uses the stock cylinder head studs for simple installation and reliable alignment. Premium construction: CNC-machined from 6061 aluminum and polished to a mirror finish for corrosion resistance and a showroom appearance. Compatible with NOSS and Pro Design domes: Accepts popular dome options for customization and performance tuning. Ideal for riders and racers seeking improved cooling, longevity, and a polished look, the Modquad Billet High-Performance Head is a high-quality aftermarket upgrade for demanding applications.