Spotlight
From the front, the bonnet gives it away. Where the standard M3 has a smooth surface with the two gills, here a power dome rises, the kind BMW drew for the V8 that never existed in the E46. Below it, left and right of the apron, two flaps in visible carbon. The rest is restraint: dark grey metallic, 19-inch wheels in M double-spoke, the top open.
An M3 E46 Convertible, first registered in 2003, SMG transmission, two previous owners. At 119,760 kilometres it stood in front of the workshop in 2019 for photos — a fair-weather car with an equipment list that suits a clubsport car more than a convertible.
What’s different under the bonnet
The core of the conversion sits to the right of the valve cover: a clubsport airbox made of carbon that replaces the standard air filter box. This lets the S54 draw air through a shorter, smoother path — the principle BMW Motorsport used to let the CSL breathe, here as an aftermarket solution. According to the seller at the time, the engine thus produces around 361 PS (265 kW); from the factory it is 343 PS. A sport exhaust system with four tailpipes handles the other side of the gas exchange.
More notable than the extra power is the engine’s history: at 96,000 kilometres, the engine and transmission were replaced. Anyone familiar with the S54 knows why this is good news for a buyer — the connecting rod bearing shells of the early production years are this engine’s best-known issue, and a replacement engine with a documented mileage removes exactly that concern.
Above both stretches an aluminium strut brace between the strut towers. In the convertible, which lacks the roof structure for stiffening, it is not mere decoration.
Bonnet, carbon, interior
The lightweight bonnet with the V8 power dome is the most striking part on the car — and the only one that changes the silhouette. It saves weight at the front axle and creates clearance above the engine; on the six-cylinder, the dome itself is styling, not necessity.
Carbon runs through the car as a motif without becoming loud: mirror caps, the flaps on the front apron, and inside the interior trim strips on the dashboard and the spoke covers of the M steering wheel. Add to that black leather, a navigation system, SMG shift paddles on the steering wheel. An interior that shows someone here was looking for details, not presence.
Context
The E46 M3 Convertible is one of those cars that long stood in the shadow of the coupé — heavier, softer, and without the CSL as a beacon. That is exactly what makes examples like this one interesting: anyone who brings the ingredients of the clubsport into the convertible gets to hear the S54 in its freest form, with the top down. The conversion remains reversible, and the substance — with a replacement engine, two previous owners and garage keeping — is better documented than in most coupés from this era.
The photos were taken in 2019 at MOTORSPORT24 in Berlin, where the car was offered for sale at the time. The text describes the condition as it was then.
The data
- Vehicle: BMW M3 E46 Convertible, SMG, first registered 2003
- Mileage: 119,760 km (as of 2019), engine and transmission replaced at 96,000 km
- Engine: S54, carbon clubsport airbox, sport exhaust system — around 361 PS (265 kW) per seller’s information, standard 343 PS
- Bodywork: Lightweight bonnet with V8 power dome, carbon flaps at the front, carbon mirror caps, aluminium strut brace
- Interior: black leather, carbon interior trim strips, M steering wheel with SMG shift paddles, navigation
- History: two previous owners, garage-kept fair-weather vehicle, no maintenance backlog
Bildnachweise
- Own photograph · MOTORSPORT24