1985–1991 Corvette C4 L98 ProCharger D-1 Non-Intercooled Tuner Kit
ProCharger 1GB211-D1 D-1 Non-Intercooled Tuner Kit for 1985–1991 Chevrolet Corvette C4 with the original 5.7L L98 TPI engine. Excludes ZR-1/LT5 and engine swaps.
Hardware and configuration
D-1 supercharger with factory-style 6-rib drive. Satin finish is standard; polished supercharger and bracket finish adds $700.
This catalog configuration is non-intercooled. Fuel-system upgrades and custom tuning must be supplied separately; do not assume the complete system’s intercooler or fuel hardware is included.
Manufacturer specifications designate this D-1 tuner kit for modified engines only. Boost, pulley choice and fuel/calibration requirements must be matched to the actual engine build.
Installation and ordering
Special-order kit requires a manufacturer order form and non-refundable deposit; additional lead time may apply. Provide VIN, year, transmission, suspension equipment and all engine/fuel/exhaust modifications. Suspension configuration may require hood or bracket modifications. Manufacturer suspension exclusions require compatibility review before order release. Larger injectors may be necessary for higher-boost configurations.
Emissions
No emissions certification is claimed for this configuration. Confirm permitted use and registration-state requirements before ordering.
Processing & Shipping Overview
Processing occurs before shipping.
Most in-stock items typically process within 2–3 business days before shipment or pickup. Expedited shipping options affect transit time after an order ships and do not speed up processing.
Made-to-order, special-order, vendor drop-ship, and freight items require additional processing time before shipping. Any extended lead times will be noted on the product page when applicable.
For the most up-to-date order status or lead time questions, please contact sales@smgspeed.com or use live chat during business hours.