Buick Grand Roadmaster - Hypertech Power Chips are direct replacements for the stock chips in 1981-1995 GM vehicles. The Power Chip contains the Hypertech Power Tuning data that controls the engine's air/fuel ratio and spark advance. Power Chips can be installed in less than 30 minutes using only hand tools. No wiring or soldering is required - just plug in and go.

Buick Grand National Hypertech

• Buick Grand Roadmaster - Hypertech 41372 Chip Computer Performance T Type/gn 3.8sfi Trb 86-7 - 87 Buick Grand National Automatic W/overdrive, Except California Models 3.8L SFI TURBO engine
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Hypertech Power Tuning: tunes the engine for maximum power and performance, plus potential gas mileage improvements; permits use of low-temperature thermostat for cooler, denser intake charge and lower engine operating temperature resulting in faster acceleration; allows the vehicle's top speed to be matched to the speed rating of high-performance tires; and delivers firmer, full-throttle gear changes.