OneFastShop B58 4.5 Inch Catless Downpipe BMW Supra A90

BMW B58 4.5 Inch Catless Downpipe - M240i M340i 440i 540i 840i / Toyota Supra A90 2016-2024 - OneFastShop

OneFastShop SKU: B58DP
Price
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In Stock – Ready to Ship
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Take the restriction out of your B58 with the OneFastShop 4.5 inch catless downpipe. The factory catalytic converter is the largest restriction in the exhaust - removing it frees up real power, spools the turbo sooner, and opens up the deep, aggressive growl the B58 was built to make. Fits a wide range of F chassis and G chassis B58 BMWs plus the Toyota GR Supra A90 from 2016 to 2024.

Expect +30 to +40 horsepower with a supporting tune (more on upgraded turbos), faster spool, and sharper throttle response. It's a direct bolt-on with no cutting required, works with OEM and aftermarket cat-back exhausts, and is backed by a 6-month warranty on defects.

Specifications

Diameter 4.5 inch (full diameter from turbo outlet)
Material 304 grade stainless steel, mandrel bent
Flanges CNC machined billet
Welding Hand TIG welded
Flex section Integrated
Mounting Welded bracket included
Configuration Catless (race), catalytic converter removed
Engine BMW B58 (F chassis, G chassis) and Toyota B58 (Supra A90)

What's in the Box

  • 1x B58 4.5 inch catless downpipe
  • Welded mounting bracket

Installation & Tuning Notes

Gasket required: A turbo-to-downpipe gasket is required to seal the downpipe to your factory turbo. Our 4.5 Inch Turbo to Downpipe Gasket for BMW B58 and Toyota Supra is sold separately - add one to your order.

Tuning & check engine light: Removing the cat means the rear O2 sensor will eventually set a check engine light (a catalyst efficiency code such as P0420) on an otherwise stock car. This is normal for any catless downpipe and not a fault with the part. To run it correctly and keep the light off, the car should be tuned with the rear O2 sensor turned off - any major B58 tuning platform supports this. We strongly recommend installing this downpipe with a supporting tune rather than on a stock vehicle.

Off-road use: Intended for off-road and track use only. Not legal for use on public roads and may not comply with emissions regulations. Check local laws before installation.

Fitment

Year Make Model Submodel Engine
2016-2021 BMW 1 Series M140i (F20/F21) B58
2016-2021 BMW 2 Series M240i / M240i xDrive (F22/F23) B58
2016-2018 BMW 3 Series 340i / 340i xDrive (F30/F31) B58
2019-2024 BMW 3 Series M340i / M340i xDrive (G20/G21) B58
2016-2020 BMW 4 Series 440i / 440i xDrive (F32/F33/F36) B58
2021-2024 BMW 4 Series M440i / M440i xDrive / Gran Coupe (G22/G23/G26) B58
2017-2023 BMW 5 Series 540i / 540i xDrive (G30) B58
2016-2022 BMW 7 Series 740i / 740Li / xDrive (G11/G12) B58
2020-2024 BMW 8 Series 840i / xDrive / Gran Coupe (G14/G15/G16) B58
2018-2024 BMW X3 M40i (G01) B58
2018-2024 BMW X4 M40i (G02) B58
2020-2024 BMW X5 xDrive40i (G05) B58
2020-2024 BMW X6 xDrive40i (G06) B58
2018-2024 BMW X7 xDrive40i (G07) B58
2019-2024 BMW Z4 M40i (G29) B58
2020-2024 Toyota Supra A90 3.0 B58

Read before you buy. These guides cover fitment, what to expect, and how to install.

Shipping

  • Orders placed before 3 PM ET typically ship the same business day. Larger items ship within 1 to 3 business days.
  • Standard, expedited, and overnight options at checkout.
  • Oversized items ship by freight and take longer.
  • Special order items follow a lead time we confirm with you individually before the order is committed.
  • Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
  • Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
  • International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

  • 30 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
  • Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
  • Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
  • Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
  • Product images may be representative. The SKU and specifications in the listing are what ships.
  • Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Returns & Refunds · Warranty
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