OneFastShop S58 Catless Downpipes for the BMW M3, M4 & M2 | +30-50 HP, Free Shipping

The BMW S58 is a monster straight out of the box, but BMW still leaves power on the table with restrictive, heavily catted factory downpipes built to meet emissions rather than make the most of the engine. Swapping them is the single highest-impact bolt-on you can do to a G80 M3, G82 M4, or G87 M2. The OneFastShop S58 3-inch catless downpipes strip out both factory cats to unlock real power, faster spool, and the aggressive twin-turbo growl the S58 was built for - and they ship free to all 50 states with no minimum.

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What a Catless Downpipe Does on the S58

The downpipes are the sections of exhaust that bolt directly to each turbo and route gases into the rest of the system. From the factory, both downpipes carry catalytic converters that create backpressure and choke the twin-turbo S58. Replacing them with a full 3-inch catless design lets exhaust gas exit the turbos far more freely - the result is quicker spool, sharper throttle response, and the headroom to make serious power once tuned.

Real-World Performance Gains

With a supporting tune, these downpipes deliver a major jump:

• +30 to +50 horsepower with proper tuning
• Even more on big-turbo and upgraded builds
• Dramatically faster turbo spool and sharper throttle response
• Aggressive twin-turbo growl from idle to redline
• Stage 2+ tune ready, supports serious power builds

The full 3-inch diameter is maintained from each turbo outlet back. To realize the gains and keep fueling correct, always pair the downpipes with a supporting tune.

Built to Last

These are built from 304-grade stainless steel with mandrel-bent tubing, CNC-machined billet flanges, and hand TIG-welded joints. Welded mounting brackets and integrated flex sections on both pipes keep everything solid and leak-free, Grade 12 mounting hardware is included, and the set is backed by a lifetime warranty on defects. They are compatible with both OEM and aftermarket cat-back exhausts, and fit both left- and right-hand-drive cars.

Fitment

This paired set is engineered for the S58-powered G-chassis M cars:

• 2021-2026 BMW M3 G80 (incl. Competition)
• 2021-2026 BMW M4 G82 / G83 Convertible (incl. Competition)
• 2023-2026 BMW M2 G87 (incl. Competition)

Driving an X3M or X4M instead? We make a dedicated S58 downpipe set for the F97 X3M and F98 X4M as well.

Don't Forget the Gaskets

The S58 is a twin-turbo engine, so installation requires two turbo-to-downpipe gaskets to seal the pipes to your factory turbos. Add a pair of our 3.5-inch S58 turbo-to-downpipe gaskets to your order so you have everything you need on install day. These are single-use crush seals and should always be replaced when the exhaust connection is separated.

Installation

The downpipes are a direct bolt-on with no cutting required, and Grade 12 mounting hardware is included. Plan to have the car tuned afterward to take full advantage of the added flow and keep fueling and fault codes in check.

A Note on Legality

Catless downpipes remove the catalytic converters and are intended for off-road and track use only. They are not legal for use on public roads and may not comply with emissions regulations in your area. Check your local laws before installing.

Why Buy From OneFastShop

• Free shipping to all 50 states, no minimum - the price you see is the price you pay.
• Next-day delivery on our typical orders, so you are not waiting weeks to start your build.
• Lifetime warranty on defects and genuine OneFastShop-built quality.
• BMW M expertise - we can confirm the right setup for your exact chassis before you order.

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Frequently Asked Questions

How much power do S58 catless downpipes add?

With a supporting tune, expect roughly +30 to +50 horsepower, with larger gains on big-turbo and upgraded builds, plus noticeably faster spool and throttle response.

Do these fit my G80 M3, G82 M4, or G87 M2?

Yes. This set fits the 2021-2026 M3 G80, 2021-2026 M4 G82/G83, and 2023-2026 M2 G87, including Competition models. For the X3M (F97) or X4M (F98), we offer a dedicated S58 downpipe set.

How much is shipping?

Shipping is free to all 50 states with no minimum order. Our typical delivery time is next day, so you get your downpipes fast.

Do I need anything else to install them?

You will need two 3.5-inch turbo-to-downpipe gaskets, since the S58 is twin-turbo. We sell them separately so you can add a pair to your order. Grade 12 mounting hardware is included with the downpipes.

Do I need a tune?

Yes. A supporting tune is strongly recommended to realize the power gains and keep fueling correct. The downpipes are Stage 2+ tune ready.

Are catless downpipes street legal?

No. Because they remove the catalytic converters, they are intended for off-road and track use only and are not legal for public road use or compliant with emissions regulations in many areas. Check your local laws first.