Suggested Retail:$50. Trans-Dapt Performance Products 2517 - Trans-Dapt Performance Torque-Curve MPFI Spacers. Torque-Curve MPFI spacers go a step further by conditioning the airflow, and thereby reducing turbulence for unsurpassed power gains, smoother acceleration, and better fuel economy. The result is a denser air/fuel mixture in the combustion chamber, which means more horsepower, more torque, and better fuel mileage. Plus, they feature a non-whistle design.. 8.2 x 5.2 x 2 inches. 7 DAY FULL REFUND GUARANTEE ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 DAY STORAGE IS ALSO AVAILABLE. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.