BMS BMW/Supra Gen 1 B46 B48 Charge Pipe Blow-Off Valve (BOV) Kit

BMS B46 / B48 Charge Pipe with Blow-Off Valve – Sound, Performance and Reliability

Looking to finally get that proper turbo blow-off sound from your Gen 1 B46 or B48 powered BMW or Supra? This BMS charge pipe upgrade with a Turbosmart Raceport blow-off valve delivers exactly that – along with improved reliability and performance.

The high-flow aluminum construction replaces the restrictive OEM charge pipe and allows excess boost pressure to vent cleanly to atmosphere, producing the sharp and satisfying “pshhh” sound while reducing compressor surge.

View installation guide

Key Features

• Iconic blow-off valve sound
• Improved reliability at higher boost levels
• Smooth OEM-style fitment
• Increased diameter for improved airflow
• CNC-machined throttle body and turbo flange
• Reduces compressor surge
• Compatible with factory tuning, JB4, and flash tuning
• Multiple 1/8 NPT ports for boost gauges or methanol injection
• Heavy-duty reinforced silicone coupler included
• Fully reversible installation

Product Details

The BMS Elite charge pipe is built from high-quality aluminum with a durable matte black finish that blends seamlessly into the engine bay. Precision CNC-machined connections ensure a tight, leak-free fit similar to OEM.

This version includes the Turbosmart Raceport blow-off valve, designed to efficiently release excess pressure when lifting off throttle. This not only enhances sound but also protects the turbo system under demanding conditions.

Replaces OEM BMW part number: 13718601683

Recommended Upgrades

For optimal performance with the factory intake, we recommend pairing this with a BMS turbo inlet upgrade or a performance intake system.

What’s Included

• Turbosmart Raceport blow-off valve
• Aluminum upper charge pipe
• Aluminum lower charge pipe
• Reinforced silicone coupler
• T-bolt clamps
• 1/8 NPT plugs and fittings
• Installation hardware including bolts, O-ring, and clips
• Vacuum line and fittings

Check Youtube sound sample:

Vehicle Fitment

BMW 1 Series

• 2016–2019 F20 F21 LCI 120i / 125i

BMW 2 Series

• 2016–2021 F22 F23 220i / 230i including Convertible and xDrive
• 2022–2025 G42 230i including xDrive

BMW 3 Series

• 2016–2019 F30 F31 F34 LCI 320i / 330i including Touring, Gran Turismo and xDrive
• 2016–2018 F30 330e
• 2019–2025 G20 G21 330i including Touring and xDrive
• 2021–2025 G20 G21 LCI 330i including Touring and xDrive
• 2019–2025 G20 330e

BMW 4 Series

• 2015–2020 F32 F33 F36 420i / 430i including Gran Coupe, Convertible and xDrive
• 2021–2025 G22 G23 G26 430i including Gran Coupe, Convertible and xDrive

BMW 5 Series

• 2017–2020 G30 G31 520i / 530i including Touring and xDrive
• 2018–2023 G30 530e
• 2021–2023 G30 G31 LCI 520i / 530i including Touring and xDrive

BMW 6 Series

• 2018–2024 G32 630i Gran Turismo

BMW 7 Series

• 2016–2019 G11 G12 730i / 730Li
• 2020–2022 G11 G12 LCI 730i / 730Li
• 2016–2022 G11 G12 740e / 740Le including xDrive

BMW X3

• 2018–2021 G01 20i / 30i including xDrive
• 2022–2024 G01 LCI 20i / 30i including xDrive

BMW X4

• 2019–2021 G02 20i / 30i including xDrive
• 2022–2025 G02 LCI 20i / 30i including xDrive

BMW X5

• 2019–2023 G05 xDrive40i (2.0L markets)

BMW X6

• 2020–2023 G06 xDrive40i (2.0L markets)

BMW Z4

• 2019–2025 G29 sDrive30i

Toyota GR Supra

• 2020–2026 Mk5 2.0L B48 turbo