The Akrapovic RACING systems for the 07-08 R1 are made of stainless steel piping with a specific 4-2-1-2 configuration. Mufflers are available with either titanium or carbon-fiber outer sleeves (outlet caps are made of carbon-fiber on both). Includes silicon coated strings and carbon can straps for both models. Gains of 7-9 HP can be achieved with these systems (tuning device like a Dynojet PC3 usb is recomended also). Use pull down menu to select style.