# BMW Spec E46

- Source: https://racingcarnetwork.com/wiki/bmw-spec-e46/
- Publisher: Racing Car Network (racingcarnetwork.com), the race car marketplace
- Type: car · Brand: BMW
- Discipline: gt-cup
- Series: one-make-cup
- Era: 2000s
- Last updated: 2026-07-06

Spec E46 is America's answer to affordable wheel-to-wheel racing at scale: NASA's one-make class freezes the 330Ci at a fixed, sealed specification — huge grids, spec everything, and the racing decided by craft alone.

## Specifications

| Spec | Value |
|---|---|
| Engine | 3.0 L M54 inline-6 (sealed spec tune) |
| Power | ~230 hp (spec) |
| Weight | Spec minimum with driver (class-defined) |
| Gearbox | 5-speed manual (spec) |
| Chassis | E46 330Ci shell, reinforced subframe mounts |
| Suspension | Spec MCS package |
| Years | 2015–present (class era) |
| Class | NASA Spec E46 one-make |

## History

NASA (National Auto Sport Association) built Spec E46 on the Spec Miata blueprint applied to a better platform: the E46 330Ci's M54 3.0 six, a mandated spec package — Motion Control suspension, defined aero, sealed ECU tune, spec wheels and tyres — and a rulebook engineered so that build cost and speed ceiling stay flat. Launched nationally in the mid-2010s as E46 prices bottomed, the class exploded.

Grids became the point: Spec E46 fields at NASA nationals and regional weekends run deep into the dozens, championship racing is genuinely close (podiums separated by tenths across 30-minute sprints), and the community's build-standard documentation makes car-to-car parity real rather than theoretical.

The market functions like a stock exchange for identical goods: cars trade on build quality, maintenance records and logbook history within a narrow band, entry costs undercut any European GT-adjacent class, and the platform's parts commonality with millions of road E46s keeps consumables grocery-priced. For US club racers wanting maximum racecraft per dollar, Spec E46 is the modern default answer.

## Palmarès

NASA National Championships in Spec E46 since the class's national adoption — the title that crowns America's deepest E46 grids — plus regional championships across every NASA division and the endurance-adjacent presence of SE46-built cars in club enduros nationwide.

## What to check before you buy

The build sheet against the current NASA rule set is the purchase: spec suspension (correct MCS package), sealed/compliant engine and tune, legal weight and aero, and a logbook with tech-inspection history — a 'Spec E46' outside spec is just a track E46 at the wrong price. M54 diligence applies (cooling system age, rod-bearing history on hard-used engines, subframe-mount reinforcement mandatory), and honest hour-counting on consumables. Buy from active NASA paddocks where the car's race history is public knowledge; championship-winning builders' cars carry deserved premiums.

## Did you know

- Spec E46 chose the 330Ci partly because depreciation had made donor cars cheaper than the parts to build them — the class institutionalized a market accident.
- NASA's parity rules extend to sealed tunes and claim provisions — the Spec Miata governance model scaled up a class.
- National-championship Spec E46 races have finished with top-fives inside two seconds — identical cars turning American club racing into touring-car television.

## Related entries

- BMW M3 (E46) — competition family — https://racingcarnetwork.com/wiki/bmw-m3-e46/
- Legend Car (INEX) — https://racingcarnetwork.com/wiki/legend-car/
- Renault Clio Cup — https://racingcarnetwork.com/wiki/renault-clio-cup/
- Ford Mustang FR500 (race) — https://racingcarnetwork.com/wiki/ford-mustang-fr500/