Grand National Performance Chip — “Extender 55ln injectors and 22°' (Aftermarket)

This ECU chip appears to be an aftermarket performance PROM labeled “Extender 55# 22°”, suggesting it was burned for 55 lb/hr injectors with approximately 22° of timing, intended for the 1986–1987 Turbo Buick platform. The “Extender” name was commonly used for chips designed to support additional airflow and MAF ranges beyond stock.

🟡 Yellow Dot – Actual Aftermarket Tune Performance Unknown 

🔧 Compatibility:
• 1986–1987 Buick Grand National / Turbo T / T-Type / GNX
• Fits OEM 1227148 ECU (factory Turbo Buick computer)

📦 Includes: Chip only (as pictured)

Condition Notes:
• Hand-labeled aftermarket chip
• Pins intact, no corrosion observed
• Intended for modified setups with 55# injectors

Why You Want It:
Ideal for enthusiasts running 55 lb/hr injectors who enjoy experimenting with older performance tuning styles and airflow-extended chips. Great for collectors of historic Turbo Buick tuning solutions or for bench testing aftermarket calibrations.

⚠️ Disclaimer:
Tune parameters are unknown and not verified. T6P has not tested this unit for drivability, timing, or fueling. All items are sold as-is with no returns or exchanges. Buyer is responsible for verifying compatibility with their ECU and injector setup.