These 4” diameter disc-based megaphone series are our signature muffler and provide 8-10% horsepower gains. Our original ground breaking 2:1 system and years of flat track racing and testing have proven the success of technology these were designed with proving they have stood the test of time.

The classic megaphone design allows the exhaust gas to expand which increases power while the discs let you control just how much flow you want. Optional open end caps for closed course competition are also available.

Available as slip-ons, 2:1, 2:2 and 2:2 XR Style systems – the 2:2 XR Style system provides a bolt-on 20% horsepower gain.

Twelve - 4” discs are included with slip-ons and the 2:1.

Twenty-four - 4” discs are included with the 2:2 systems – that’s 12 discs per muffler.

Add 4” discs to increase horsepower, exhaust tone and flow.

Remove 4” discs to reduce sound and increase low-end-torque.

*3 Mit Anschluß Lambdasonde

*4 Alle Anlagen ohne Kat. Kat kann gegen Aufpreis bestellt werden.

* 5 Wir empfehlen die Verwendung eines Fuel Management System wie das FI2000 oder den Power Commander oder einen Jetkit bei Vergaser Modellen.

* 7 Ohne wechselbarem DB Killer