High-performance heavy-duty two-stroke expansion chamber engineered to deliver robust, tractor-like bottom-end and midrange power for early-2000s Austrian big-bore off-road and enduro applications. Constructed from tough 18-gauge carbon steel to withstand severe rock strikes, heavy trail abuse, and extreme thermal cycling while significantly improving low-end torque and throttle response.
Specs & Details
- Manufacturer Part Number: 78-1504
- Alternative Part Number: FMF 025016 / 1820-0087
- Component Type: 2-Stroke Expansion Chamber / Exhaust Pipe
- Material & Construction: Heavy-gauge 18-gauge carbon steel with a nickel-plated finish
Two-Stroke Vehicle Fitment
| Make | Model | Engine Type | Year Range |
| KTM | 250 / 300 SX / EXC / MXC | Two-Stroke Motocross / Off-Road | 2001–2003 |
TSO Garage Note
The ultimate armor upgrade for bulletproofing early-2000s KTM big-bores. This heavy 18-gauge chamber beefs up bottom-end torque to give you smooth, tractable power for lugging through tight singletrack or steep hillclimbs, while easily absorbing the brutal rock and tree impacts that turn stock expansion chambers into scrap metal.
