aFe 18-21 Ford Mustang GT 5.0L 85mm Billet Throttle Body (afe46-39101)

OFF-ROAD OR MOTORSPORTS USE ONLY. This part is not CARB legal. It is not legal for sale or use on pollution-controlled motor vehicles in California or in other states that follow California emissions rules. It is sold for off-road or motorsports use only.

This is the aFe 18-21 Ford Mustang GT 5.0L 85mm Billet Throttle Body. Part afe46-39101. A larger throttle body increases airflow into the intake manifold.

Test results on aFe's Dynojet dyno showed power gains across the power band, topping out at +17 HP and +15 lb-ft torque at 6,000 rpm. Testing was conducted on a 2020 Mustang 5.0 comparing stock and the aFe Power BTB (all tests conducted using 91-octane fuel). No other modifications to the vehicle were made, so imagine the potential when you add in other performance enhancing products such as a cold air intake, tuner and cat-back exhaust! By the way, for you truck enthusiasts, this product also fits the F-Series (see application table for exact vehicle fitment). Not only did we increase the bore diameter from the stock 80 mm to 85 mm, we redesigned the throttle body from the ground up, aerodynamically improving the air flow path. Why 85 mm and not larger? 3 reasons: 1) At 85 mm, no custom tuning is required so this works right out of the box; 2) The 85 mm diameter provides a direct path into the 84 mm intake manifold opening, a larger diameter would require modification to the stock manifold, or use of an aftermarket one; and 3) The mounting diameter for your intake tube is only slightly increased, but it allows you to retain the stock intake tube or you can upgrade to a cold air intake without having any special adapters. Not wanting to be like the rest, aFe chose to make the BTB out of billet 6061-T6 aluminum, precision machined and capped off with a black anodized finish for that stealthy custom look. As a finishing touch, we have laser etched the aFe Power logo and throttle body size right on the top. The throttle plate is made of brass, the significance here is to eliminate the chance of galling against the aluminum body. Each throttle body is serialized for authenticity.

Features and benefits

• 85mm Bore Diameter
• No tuning required
• Aerodynamically designed flow path
• Dyno proven HP and TQ gains
• Retains OEM electronics and gearing mechanism
• No rough idling, No CEL
• Billet Aluminum, precision machined, black anodized finish
• Perfect fitment, subtle, custom look
• Furnished complete, all hardware included
• Simple installation, less than 1 hour

Product details

• Part type: Throttle Bodies
• Brand: aFe
• Gaskets Included: No
• Horsepower Increase: 17
• Torque Increase: 15
• Color: Black
• ECU Tuning Required: No
• Finish: Anodized
• Grade Type: Performance
• Inside Diameter: 85
• Material: 6061-T6 Aluminum
• Mounting Hardware Included: Yes
• aFe part number: afe46-39101

Fitment

• Vehicle: Ford Mustang (S550), Ford Mustang (S650)
• Years and trims on file: 2019-2020 Ford Mustang Bullitt; 2018-2025 Ford Mustang GT; 2018-2021 Ford Mustang GT Premium; 2021 Ford Mustang Mach I
• Application listing: aFe 18-21 Ford Mustang GT 5.0L 85mm Billet Throttle Body
• Check the vehicle, model years, engine and trim above against your car before ordering. Not sure? Ask us and we will check it against your VIN.

Emissions: off-road or motorsports use only

This part is not CARB legal and is sold for off-road or motorsports use only. It is not intended for use on vehicles driven on public roads. By ordering, the buyer accepts responsibility for checking and following federal, state and local emissions laws where the vehicle is used. Questions? Ask us before you order.

Shipping & returns

• Orders are processed within 1–3 business days; standard delivery is 3–7 business days within the United States.
• aFe parts are supplied through our distributor. We confirm availability and lead time with you after you order.
• We currently ship within the U.S. only. See our Shipping Policy.
• 30-day returns on unused parts in original packaging — see our Return Policy.

Installation at Team ANBD

Team ANBD is a performance shop in Andover, New Jersey. We can align or corner-balance the car, and prep track cars. Book an appointment or ask us about installation and fitment before you order.

California Proposition 65

WARNING: This product can expose you to chemicals known to the State of California to cause cancer or reproductive harm. For more information go to www.P65Warnings.ca.gov.