Eight titanium and stainless mufflers: cylinder, oval and bullet bodies, plus valvetronic silencers with vacuum-controlled valves and two BMW-specific valved mufflers in SS304.
Body shapes and what they suit
| Body | Construction | What it is for |
|---|---|---|
| Cylinder | Straight-through, 2.5–4 in inlet | Inline packing on a custom system where space is a tube, not a box |
| Oval | Single inlet/outlet mirror polished, or dual inlet/dual outlet | Tighter packaging than a cylinder, and the dual-inlet version suits V-bank systems |
| Bullet | Conical, straight-through, 18 in body | Where the silencer has to taper with the pipe run |
| Valvetronic | Single or dual vacuum-actuated valves | Switchable volume — quiet path and open path in one body |
Valvetronic or straight-through?
A straight-through body has one path: whatever it does, it does all the time. A valvetronic body has a valve that opens a second route, so the same muffler can be quiet at low load and open when you want it. The trade is complexity — a vacuum signal, a controller and somewhere to route the line.
If the car already has a factory valved system, the vehicle-specific BMW 340i valved muffler and BMW 530i valved muffler in SS304 are direct starting points. For a custom build, the titanium cylinder straight-through is the simplest body to package.
The wider question — whether a valved system is worth the extra hardware — is covered in the valved vs non-valved comparison.
All eight carry a one-year warranty. Inlet sizing is measured at the pipe, not at the old silencer's part number.