KRM Underframe Exhaust 70–78cc Derbi – Multifix Race System (without silencer)

The KRM 70–78cc Underframe Exhaust is a race-ready expansion exhaust designed for circuit and competition use. Built for powerful 70–78cc setups like 2Fast, Barikit, or Stage6, it ensures optimal high-RPM performance.

Handcrafted from 15 segments of 0.8 mm thick steel, every weld and bend is optimized for flow and durability.

Its Multifix mounting system allows easy adaptation across different chassis, using a 7075 aluminum collar, adjustable bracket, and silentbloc. No silencer clamp needed due to the balanced rear mounting point.

Note: This exhaust is delivered without a silencer. For best results, use the specially designed KRM 70–90cc silencer.

Package includes:

• KRM underframe exhaust
• Machined exhaust flange
• 2x 5 mm flange spacers
• 2x flange gaskets
• Stainless steel rotating exhaust springs
• Complete KRM MULTIFIX system
• Removable curved connecting pipe
• Venturi
• KRM stickers

Maintenance: Supplied oiled. Dry after water contact and apply motor oil regularly to prevent corrosion.