QR25 Head Upgrade
Upgrading the head of your QR25 is necessary to allow the engine to achieve your power goals. Parts like valves, valve springs, camshafts, retainers, and seals aren't built from the factory to handle the increased stress of turbocharging. Treadstone builds each head with precision and care to make sure that your head leaves our performance facility ready to make the power that you're looking for.
Stage 1: We upgrade your camshafts with JWT Camshafts and Valve Springs
Stage 2: Includes the Stage 1 kit and we add upgraded valves, valve locks, and valve retainers. We also gasket-match the intake and exhaust port.
Stage 3: Includes the Stage 1 and Stage 2 kit and we add 1mm oversize valves and polish the combustion chamber.
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