High-Flow 304 Billet Exhaust Flange Kit | 1994-2003 KTM 250/300/360/380

Eliminate chronic exhaust drool, blown gaskets, and lost primary scavenging once and for all with the Two-Strokes Only High-Flow Billet Exhaust Flange (Replaces KTM Part No. 54605073000). The factory exhaust mating surface on classic KTM powerplants is notorious for warpage, vibration wear, and messy sealing failures under heat cycling.

Engineered for ultimate durability and improved gas dynamics, this heavy-duty upgrade is CNC-machined from solid 304 Stainless Steel to resist thermal fatigue and corrosion while optimizing internal flow transitions. By ditching the failure-prone flat gasket setup in favor of a positive-locking dual O-ring seal, it guarantees an absolute, leak-free connection between your cylinder and expansion chamber.

Vehicle Fitment

Kit Contents:

• CNC-Machined 304 Stainless Steel High-Flow Billet Exhaust Flange
• High-Temperature Viton O-Ring Sealing Set

TSO Tip

When bolting on your stainless high-flow flange, make sure the cylinder port face is polished completely clean of old gasket material. Apply a dab of high-temp silicone grease to the Viton O-rings during final assembly to protect them against initial thermal shock and lock in a permanent, zero-leak seal.