Kristian Grimsland
Associate Editor, Muscle Mustangs & Fast Fords
March 9, 2014
12 BBK Performance sent us a throttle body spacer (PN 1502, $59.99) in order to bolt on the throttle body.
13 The old aftermarket cold-air-intake was heavily rusted and worn. We decided to install a new BBK cold-air intake (PN 1557, $159.99) in its place.
14 Here’s what our new Performer intake looked like installed.
15 Here’s a side-by-side comparison shot of the Performer (left) to RPM II intake. Notice difference in runner length and plenum size.
16 We installed the RPM II intake in-house at our Tampa headquarters. Tech Center Manager Darrell Kunda handled the swap.
17 With the RPM II intake installed, we wanted to maximize our airflow. Previously, we had a 65mm BBK throttle body installed. BBK supplied us with a 70mm throttle body to match the plenum inlet size.
18 Though peak horsepower increased, we feel the Performer may be what we need for our Fox. It serves daily driver duties, and is constantly driven on the street. If your Fox is used on the dragstrip and sees high-rpm shifts frequently, then you might want to consider the RPM II for top-end performance
Previously, with the old Cobra intake installed onto our refreshed short-block, our Fox laid down 290 rwhp and 318 lb-ft of torque.
After installing the Performer intake, we cranked out 300 rwhp and 337 lb-ft of torque. That’s an increase of 10-peak rwhp and 19 lb-ft over before.
With the RPM II intake, our Fox made 310 rwhp and 330 lb-ft of torque. We picked up 10-peak rwhp and lost 7 lb-ft. The loss can be attributed to the shorter runner length.
After the new throttle body was installed, we threw our Fox on the dyno again. This time it wheeled 313 rwhp and 329 lb-ft of torque. We picked up 3 rwhp and lost 1 lb-ft.