Description
Unlock the full potential of your B46-powered BMW or Toyota Supra with this 3.5″ Race Downpipe. By removing the restrictive factory catalytic converter, this downpipe frees up exhaust flow, delivering:
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Faster turbo spool and quicker throttle response
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Aggressive exhaust tone that enhances driving excitement
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Real performance gains – up to +18–23hp with tuning
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Improved airflow that supports higher boost and smoother power delivery
Constructed from 304-grade stainless steel, this downpipe is TIG-welded and mandrel-bent for maximum durability, strength, and precision. The design minimizes turbulence while maximizing exhaust gas velocity for consistent results on both street and track.
It installs as a direct bolt-on upgrade, compatible with OEM and most aftermarket exhaust systems, and fits both RHD and LHD applications without modifications.
Why Choose This Downpipe?
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Best sound upgrade – deeper, more aggressive tone
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Proven performance – +18–23hp with a proper tune
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Durable build – stainless steel, TIG-welded, corrosion resistant
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Direct fitment – bolts up to factory mounting points
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Designed for the US-market B46 – correct flange fitment, unlike generic B48 downpipes
Technical Specs
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Material: 304-grade stainless steel
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Diameter: Full 3.5″ mandrel-bent tubing
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Welding: TIG-welded for strength and longevity
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Performance: +18–23hp with tuning
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Compatibility: OEM and aftermarket exhaust systems
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Configuration: Race setup (catalytic converter removed)
Fitment Clarification
This downpipe is often referred to as a “B48 downpipe” internationally. However, the U.S.-market only uses the B46 engine in this generation, which features a different flange. This downpipe is engineered specifically for the B46 SULEV engine and will not fit global B48 variants. Always confirm fitment before ordering.
Vehicle Fitment
Toyota Supra
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2020+ A91 2.0 (B46)
BMW 2 Series
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2016–2020 220i / 220i xDrive (B46)
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2016–2020 230i / 230i xDrive (B46)
BMW 3 Series
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2016–2020 320i / 320i xDrive / 330e / 330i / 330i xDrive (B46)
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2019–2023 320i / 320i xDrive / 330i / 330i xDrive (B46)
BMW 4 Series
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2016–2020 420i / 420i xDrive / 430i / 430i xDrive (B46)
BMW 5 Series
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2016–2020 530i / 530i xDrive / 530e / 530e xDrive (B46)
BMW 7 Series
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2016–2020 730i / 730i xDrive / 740e / 740e xDrive (B46)
BMW Z4
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2019+ Z4 30i (B46)
Important Note
This downpipe is intended for off-road and track use only. It is not legal for use on public roads and may not comply with emissions regulations. Please check local laws before installation.
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