Precision. Flow. Power.

TIG-welded 5-inch catless downpipes engineered for maximum flow, faster turbo spool, and an unmistakable exhaust note.

5-INCH CATLESS DOWNPIPES  •  TIG-WELDED STAINLESS STEEL  •  1 YEAR WARRANTY  •  UK STOCK, FAST DELIVERY  • 

Why Upgrade Your Downpipe

Built for enthusiasts who want more flow, more sound, and a straightforward bolt-on install.

Faster Spool

Reduced back-pressure lets your turbo spool quicker, sharpening throttle response.

TIG-Welded Stainless

T304 stainless steel, hand TIG-welded for a durable, leak-free joint.

Increased Power & Sound

Reduced restriction increases exhaust flow for a genuine gain in power, plus a deeper, more aggressive exhaust note.

UK Stock, Fast Delivery

Dispatched from the UK with tracked shipping on every order.

ENGINEERED FOR PERFORMANCE

Built to Unleash Your B58's Full Potential

1. Remove — Unbolt the restrictive factory catalytic downpipe.

2. Fit — Bolt on your 5-inch T304 stainless catless downpipe as a direct replacement.

3. Feel It — Real performance gains: faster turbo spool, more flow, and a deeper, more aggressive exhaust note.

Exhausts

Performance exhaust systems and downpipes for BMW and beyond.
Skip to results list
2 items

Filter

  • BMW B58 Gen 1 5" Inch Catless Decat Downpipe – M140i, M240i, 340i, 440i, 540i + More

    BMW B58 Gen 1 5" Inch Catless Decat Downpipe – M140i, M240i, 340i, 440i, 540i + More

    BMW B58 Gen 1 5" Inch Catless Decat Downpipe – M140i, M240i, 340i, 440i, 540i + More
    £209.99
  • BMW B58 GEN 2 5" Inch Catless Decat Downpipe - M240i M340i M440i 540i 840i + MORE

    BMW B58 GEN 2 5" Inch Catless Decat Downpipe - M240i M340i M440i 540i 840i + MORE

    BMW B58 GEN 2 5" Inch Catless Decat Downpipe - M240i M340i M440i 540i 840i + MORE
    £209.99

Frequently Asked Questions

Will this affect my emissions?

Yes. These downpipes remove the OEM catalytic converter/OPF, so exhaust emissions will no longer meet original factory standards. They're intended for off-road, track, or motorsport use — please check your local emissions and road-legality regulations before fitting to a vehicle used on public roads.
What material are they made from?

High-grade T304 stainless steel with hand TIG-welded joints, built to resist corrosion and cracking under heat cycling.
Do you offer a warranty?

Yes — every downpipe is backed by our 1 year warranty against manufacturing defects and premature failure, no quibble replacement.
What's included in the box?

Each kit includes 1x 5-inch catless decat downpipe, ready for direct bolt-on installation. Fittings and gaskets are not included.
Do you ship outside the UK?

We're UK-based and currently ship within the UK. Get in touch if you'd like to order from further afield.