Hypertech ThermoMaster Computer Chips Air Conditioning Compressors Give your marine engine the

Give your marine engine the spark it deserves

Installation is easier since the header and gasket align on the studs before tightening

Order your COMP Cams CL12-231-2 COMP Cams Xtreme Energy 4x4 Cam and Lifter Kits for a complete cam swap solution

The 4-2-1 stepped-tube design maintains exhaust velocity at low rpm while allowing high-rpm flow that typical 4-1 designs sacrifice

SKU 065986 is backed by the manufacturer's quality guarantee and our satisfaction commitment

Hypertech ThermoMaster Computer Chips Air Conditioning Compressors Give your marine engine theThe Hypertech ThermoMaster Computer Chips (ref 0498) is a classic ECM performance upgrade from Hypertech that replaces your vehicle's stock calibration EPROM with a professionally tuned chip. For a wide range of GM, Ford, and Chrysler vehicles with OBD I and early OBD II ECUs, the ThermoMaster optimizes air fuel ratios, ignition timing, and rev limiters for real world power gains. It's the original plug in performance chip no wires, no modules, no