The Speed 21XZ-GT is an all-new 5-port engine. It features a newly developed piston and 5-scavenging port cylinder, crankshaft, crankcase to fit on-road GT track. These parts are totally different from those of spec.III. The Speed 21XZ-GT has a 7mm carburetor restrictor conform to ROAR regulation. It will be available alone or as a combo with the T-2060SC (EFRA2042) tuned pipe and the manifold in the combo set is the M2003SC, 70mm manifold specially designed for GT category for better pick-up. Both will be shipped in August.
Speed 21XZ-GT specifications: