RP RACE - STAINLESS STRAIGHTBACK BACKCOUNTRY HIGH OUTPUT EXHAUST SYSTEM - YAMAHA YZ450F 20-22 (CLEARANCE)With the straight back system we really like these as they simplify exhaust routing so there is no need to run exhaust shields or worry about burning through engine blankets. They can be quite loud but can be toned down with a quiet core insert which we also have available. Back country Direct straight back system with a 12in silencer, perfect for snowbike or dune riding. massive increase in top end power. Note This system does not include oxygen

with family members

000 - 250 SX-F/XC-F 11-12 & 250 XCF-W 12-13KTM

FE501S 2015

19-25 CRF250

KX450 4 Stroke 2019 - 2024

All new shape

21-23 MC/EX 450F

YFZ450R ATV (Carbureted) 2012 - 2012

MR 300 RACING (2021-2024)

Hub bearings diameter: 20-28 mm

AC systems we recommend a voltage regulator (L-4603) for most applications

For opening temps on the thermostat we recommend 60-70 deg celcius for 2 strokes and 80-90 deg celcius for 4 strokes depending on the application