GPR Exhaust - Trioval Slip-On for Yamaha WR 450 F - 2007 to 2011 Muffler with:dB Killer-Link Pipe It has a volume of

It has a volume of 14 litres that can be extended to 20 litres if needed

chest and back hump provide parametric performance for ventilation and superior mechanical resistance to tearing and abrasion while also being extremely thin and lightweight

and a contoured bottom edge

CE tested and certified impact protection:

Stretch panels on abdomen

GPR Exhaust - Trioval Slip-On for Yamaha WR 450 F - 2007 to 2011 Muffler with:dB Killer-Link Pipe It has a volume ofGPR's Trioval series is a GPR best seller, with a classic ovoid drop shape. It is made of hand polished 304 stainless steel and has a diameter of 100mm. Product Features SOUND: Upgraded sound from stock exhaust. Although louder than stock but in compliance with the limits prescribed by law, this exhaust produces the softest sound of all the GPR exhausts. PERFORMANCE: Upgraded performance from stock exhaust QUALITY: Italian made with high grade welding