Spectre's intake couplers and sleeves for GM mass air flow sensors are designed to adapt the majority of boot-in style GM mass air flow sensors to a 4 inch intake system. This 3-5/8 inch to 4 inch sleeve is engineered for optimum fit and function.
Spectre s intake couplers and sleeves for GM mass air flow sensors are designed to adapt boot-in style GM mass air flow sensors to a 4 inch intake system. We offer 3-5/8 inch to 4 inch sleeves as well as 3-7/8 inch to 4 inch sleeves.