TITANVEIN builds exhaust components for BMW chassis from the F-series through to the current G-series: downpipes, midpipes, cat-backs, axle-backs, tips and the fabrication stock to join them. This page maps every system we make to the chassis it fits, so you can go from "which car" to "which part" without guessing.
How a BMW exhaust is put together
Front to back, four sections. Knowing which one you are changing is the difference between a bolt-on job and a fabrication job.
- Downpipe — bolts to the turbo outlet and carries the first metre of hot gas. This is where the catalyst sits on a factory car, and where most power restrictions are.
- Midpipe — the section between downpipe and rear box. This is where an X-pipe, Z-pipe or equal-length section changes the tone and scavenging.
- Cat-back or axle-back — the rear section and muffler. A cat-back replaces everything from the catalyst back; an axle-back replaces only what sits behind the rear axle.
- Tips — the visible end. Cosmetic on most cars, but the tip inlet diameter and cutout shape have to match the bumper.
Fitment by chassis
| Chassis | Engine | Years | What we make |
|---|---|---|---|
| M3 G80 / M4 G82 / M2 G87 | S58 3.0T | 2020+ | Downpipe, single and equal-length midpipe, cat-back, valved cat-back, axle-back |
| M3 F80 / M4 F82 | S55 3.0T | 2014–2019 | Single and equal-length midpipe, cat-back, axle-back, tips |
| 3 / 4 Series | B58 3.0T | — | Downpipe, single midpipe, cat-back, valved cat-back, axle-back, tips |
| 3 / 4 / 5 Series (330i, 430i, 530i) | B48 2.0T | — | Cat-back, valved cat-back |
| M5 F90 / X5M F95 | S63 4.4T | — | Cat-back, valved cat-back, axle-back, Z-pipe midpipe |
| X Series | — | — | Downpipe, cat-back, valved cat-back, axle-back, tips |
| M5 G90 | 4.4T | 2025+ | Cat-back in titanium and stainless, valved |
| M240i G42 | B58 3.0T | 2022–2025 | Valved cat-back |
M3 G80 / M4 G82 / M2 G87 — S58
The current M car platform. The downpipe is the usual first step, then the midpipe if you want more volume without drone, then the rear section.
- All G80 / G82 / G87 parts
- Downpipe — SS304 3.5 in / 3 in / 76 mm
- 95 mm large bore downpipe — SS304
- Single midpipe — SS304 3.5 in
- Equal-length midpipe — Ti Gr5 3.5 in
- Z-pipe midpipe — SS304 2.75 in / 70 mm
- Valved cat-back — stainless
- Valved cat-back — titanium
M3 F80 / M4 F82 — S55
- All F80 / F82 parts
- 89 mm single midpipe — SS304
- Equal-length midpipe — SS304
- Valved cat-back — SS304
- Valved cat-back — Ti Gr2
- Exhaust tips — SS304
3 / 4 Series — B58 and B48
Two different engines, two different parts lists. B58 cars use a larger bore system than B48 cars, so nothing is interchangeable between them.
- All B58 parts — downpipe, single midpipe, valved cat-back, titanium cat-back, tips
- All B48 parts — 330i valved cat-back, 430i valved cat-back, 530i cat-back, titanium cat-back
- M240i G42 valved cat-back — stainless
M5 F90 / X5M F95 and X Series
- All F90 / F95 parts — cat-back, valved cat-back, axle-back, Z-pipe midpipe 3 in
- All X Series parts — downpipe, titanium cat-back, valved axle-back, tips
Choosing the material
Every BMW system above is available in SS304, and most are available in titanium. The difference is weight, heat handling and how the car sounds. If you are deciding between the two, read titanium vs stainless steel for exhausts before you pick a variant.
Choosing the joint
Anywhere the system comes apart repeatedly — midpipe to axle-back, or a turbo outlet you expect to remove — a V-band is faster and seals better than a slip joint or a two-bolt flange. Sizing is by outside diameter, not by nominal pipe size: see the V-band and flange size guide.
Questions we get before an order
Will a G80 downpipe fit an F80?
No. The S58 and S55 turbo outlets are different, so the flange pattern and the routing both change. Parts are listed by chassis for that reason.
Do I need a tune after a downpipe?
On a catalyst-equipped car, replacing the downpipe will normally trigger a check-engine light until the ECU is corrected. Plan the tune with the hardware.
Can I buy the rear section without the midpipe?
Yes on most chassis — axle-backs are listed separately. Check the inlet diameter against your existing midpipe before ordering; if they differ, a V-band clamp kit and a pair of flanges will let you join them.
What if my chassis is not listed?
We also supply universal fabrication parts — pipe, bends and bellows, V-band flanges and clamps — so a system can be built for a car we do not list yet.
Last reviewed: 2 November 2026.