Pro Circuit 304 Factory Sound Silencer ST98125SE for KTM EXC 125 SX 125 1998–2003

Name: Pro Circuit 304 Factory Sound Silencer ST98125SE for KTM EXC 125 SX 125 1998–2003
Brand: PRO CIRCUIT
SKU: ST98125SE
Price: 168.47 GBP
Availability: InStock

Fits 2 bikes

RRP £198.20 Save 15%

£168.47

incl. VAT

In stock — delivered in 6–10 working days

Dispatched in 2–3 working days · delivered in 6–10.

Part #: ST98125SE

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§ 02 / About this part

What it is

Pro Circuit 304 Factory Sound silencer to fit KTM EXC 125 (1998–2003); KTM SX 125 (1998–2003).

This exhaust canister sits at the end of your system to balance power delivery and noise. The longer body design provides a broader powerband compared to shorter versions. It uses a stainless steel intake tube and a brushed aluminium housing for durability on the track. Internal packing eventually degrades, leading to increased noise and lost backpressure. Re-pack the unit regularly to maintain peak performance. It bolts directly to your pipe. This is a standard choice for MX and cross-country where sound limits matter.

§ 03 / Specs

The numbers

Brand: PRO CIRCUIT
Part number: ST98125SE
Category: Slip-Ons
Weight: 0.92 kg
VAT: 20%

// Fitment

Will it fit your bike?

Fits 2 models · 2 year-bands

* Fitment data is provided as a guide. Verify compatibility against the bike's owner's manual or service handbook before ordering. Iron Offroad accepts no liability for incorrect application. Full terms and conditions apply.

§ 05 / About Iron Offroad

Iron Offroad

Iron Offroad is the off-road sibling of Iron City and Iron Stable — a UK shop for motocross, enduro, and trail-bike hard parts. Every fitment lives on the site, listed against KTM, Husqvarna, GasGas, Yamaha, Honda, Kawasaki, Suzuki, and Beta. Pick your bike on the timing-tower. Our USP is the data: fully enriched fitment so you find the right part for your bike quickly and get it fitted accurately. Brands you'd find on a paddock workbench — pads, sprockets, plastics, fork seals, cables, gaskets, bars, the things that actually wear out. Road-bike kit, scooter parts, and quad gear sit elsewhere; dirt and e-moto only. We operate from our storage facility in Leeds. Iron Offroad is a trading name of Iron Stable Ltd, registered in Mildenhall — Company No. 17061294. The business has a rich motorcycle history across multiple moto brands — the photos show where we came from — and recently pivoted into hard parts and online retail.