Spec E30 vs Spec E46
Updated October 26, 2026
Pick Spec E30 if you want a lighter, simpler BMW that costs less to buy and goes much easier on tires and brakes each weekend, or if you also want to cross over into SCCA ITS/STL and endurance racing. Pick Spec E46 if you want more horsepower, modern chassis stiffness and growing NASA grids, and you have the budget for bigger consumables.
What they cost to buy
Live asking prices from cars currently listed on RaceCarStuff:
A sorted Spec E30 still undercuts a comparable Spec E46, though clean E30 street shells have climbed in price, narrowing the gap on fresh builds. See Spec E30 donor cars and Spec E46 donor cars to compare what unpainted street cars cost.
Drivetrain, chassis and how they drive
A Spec E30 is a 1987–1991 BMW 325i or 325is running the 2.5-liter M20 inline six, a Getrag 260 5-speed and a 3.73 limited-slip diff on H&R Race springs and Bilstein Sport shocks. At roughly 2,700 lb with driver, it feels light on its feet, rotates predictably on its semi-trailing-arm rear suspension, and teaches momentum and smooth inputs.
A Spec E46 is a 2001–2006 330i or 330Ci with the 3.0-liter M54 inline six and a multi-link rear end. It carries several hundred pounds more weight, makes substantially more power, and stops and corners harder on wider rubber.
| Spec E30 | Spec E46 | |
|---|---|---|
| Eligible cars | 1987–1991 BMW 325i / 325is (coupe & sedan) | BMW E46 330i / 330Ci |
| Engine | 2.5L M20B25 inline six | 3.0L M54B30 inline six |
| Suspension | H&R Race springs, Bilstein Sport shocks | Spec coilovers and sway bars |
| Consumables | Lower (lighter car, smaller tires/brakes) | Higher (heavier, faster) |
| Donor shells | Harder to find rust-free | Easier to source |
| Cross-over classes | NASA SE30, SCCA ITS/STL, ChampCar, Lucky Dog | NASA SE46, NASA ST/TT, endurance |
Known weak points to inspect
Every E30 is now well over thirty years old. On a Spec E30, check for rust in the floor pans, jack points, battery tray and rear shock towers, ask when the M20 timing belt and rocker arms were last done, and inspect the trunk floor around the differential mount.
On a Spec E46, confirm the rear subframe floor mounts have been plated and reinforced, ask whether the M54 oil pump nut has been secured, and check that the cooling system has been overhauled.
Where you can race them
Both classes were created by NASA, so check your local NASA region's recent entry lists first. In some regions Spec E46 has overtaken Spec E30 in car counts; in others Spec E30 still draws steady grids and cross-enters SCCA Improved Touring (ITS), Super Touring Lite (STL) and budget endurance series.
Also considering a Miata? Read Spec Miata vs Spec E46 and run every candidate through how to buy a used race car.
FAQ
- Is Spec E30 cheaper to run than Spec E46?
- Yes. Because a Spec E30 is lighter and makes less power, tires, brake pads and rotors last noticeably longer over a season. The tradeoff is that rust-free E30 body panels and donor tubs are harder to find than E46 parts.
- Can a Spec E30 race in SCCA?
- Yes. While Spec E30 itself is a NASA class, most Spec E30s are legal in SCCA Improved Touring S (ITS) or Super Touring Lite (STL), and many cars for sale already hold both NASA and SCCA logbooks.