Developed in collaboration between the Rockstar Energy Husqvarna Motorcycles Factory Racing Team and FMF: premium FMF manifold. High-grade titanium or stainless steel quality and maximum weight reduction are the secrets behind the great success of the Rockstar Energy Husqvarna Factory Racing Team. Tangible performance boost over the entire power band. Made of titanium - that means: ultra-lightweight - or Stainless Steel. Premium machining. Manifold routing optimally tuned to match the production engine. A resonance body is also used to ensure optimal torque distribution and contribute to noise reduction. Note: For closed course competition use ONLY.