The aFe POWER 85mm billet throttle body is a bolt-on replacement for the factory unit on the 5.0L Coyote V8 in the S550 Mustang GT. It uses a larger bore, a reworked airflow path, and the stock electronics and gearing mechanism, so the factory throttle control stays in charge. The machined billet body has a black anodized finish that looks cleaner than a cast stock housing in the engine bay.
Dyno testing on a 2020 Mustang 5.0 run on 91-octane fuel showed up to +17 hp and +15 lb-ft of torque, according to the manufacturer. Its main advantage over a generic 85mm body is that the manufacturer says no custom tune is required. Owners on user forums are not unanimous, though. One reported a blade that stuck and put the car into limp-home mode until the unit was adjusted, and another doubted the gains justify the cost. Buyers should weigh the price against their goals and their tuning plans. This 85mm body also suits buyers searching for a no-tune Coyote throttle body, a 46-39101 install, or an S550 throttle upgrade.
The manufacturer states no tuning is required. Owners on user forums recommend an idle relearn after the swap, such as idling in neutral for about five minutes and then idling with the A/C on for about a minute. Some also disconnect the battery and let the engine run for a few minutes so the computer adapts.
The manufacturer says the throttle body ships complete with all hardware, and its specifications list both a filter and a coupler as included.
The manufacturer lists the 2018 through 2023 Ford Mustang GT with the 5.0L V8. Product titles and listings vary, so confirm your exact model year with the manufacturer before ordering.
The manufacturer describes installation as simple and quotes under an hour, with all hardware included. Other estimates put the job closer to two hours and rate it medium difficulty, so plan extra time if this is your first intake job. Owners on user forums suggest disconnecting the battery during the swap and checking the intake connections afterward. Confirm the blade moves freely before starting the engine, then run the idle relearn steps described above.
