ECU PROM Chip — “Pit Bull” HP137TX-528SDL (Aftermarket)

This ECU chip appears to be an aftermarket performance PROM labeled Pit Bull HP137TX-528D, copyrighted in 1990. Pit Bull chips were a popular early performance option for the 1986–1987 Turbo Buick platform, known for more aggressive fueling and timing strategies compared to OEM calibrations.

🟡 Yellow Dot – 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:
• Aftermarket “Pit Bull” chip with original label
• Pins intact, no corrosion observed
• Known period-correct tuner brand for Turbo Buicks

Why You Want It:
Great piece of Turbo Buick history for collectors, nostalgia builds, or those curious to test legendary early performance chips. Ideal for bench testing, learning old-school tuning strategies, or preserving period-correct aftermarket parts.

⚠️ Disclaimer:
This chip’s exact fuel, spark, and boost tables are not verified. T6P has not tested this unit. All items are sold as-is with no returns or exchanges. Buyer is responsible for verifying compatibility with their ECU.