1990 Thunderbird Super Coupe - Birds Of Prey - Tech
Flowmaster After-Cat And Resonator
The final modification was to swap out the factory exhaust for a Flowmaster system. In addition to the after-cat setup, Flowmaster also supplied a resonator upgrade. The combination of the after-cat and the resonator improved the power output significantly, especially at the top of the rev range. The boost gauge was now showing a peak of 14.6 psi, and we had exceeded 230 rwhp and 330 lb-ft of torque. View Related Article