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This harness allows an LS1 MAF to be used in conjuction with an LT1 engine. The LSI has a greater diameter MAF.

Caspers Electronics MAF harness adapters are plug-and-play adapters that convert the 3-wire LT1 engine harness connectors to plug directly into the 5-wire LS1 MAF sensors. They incorporate AirTemp connectors into the adapters to connect directly to the gray AirTemp sensor connectors from the engine harness.