- The Q4 employs intricate chambers, baffles and proprietary multistage packing material
- With the Q4 you don?t need to hear the power, just feel the power!
- Less sound equals more ground
- Power gains throughout the entire rpm range
- Spark arrestor included
- Pounds lighter than stock
- Rugged design for off-road endurance
- Made in the U.S.A.
KTM -- 450 XC-F -- (2008, 2009, 2010, 2013, 2007, 2014, 2012, 2015, 2011); KTM -- 450 SX-F -- (2008, 2007, 2009, 2011, 2010, 2014, 2012, 2013, 2015); KTM -- 450 XCF-W -- (2012, 2010, 2008, 2014, 2009, 2011, 2013, 2015, 2016); KTM -- 350 SX-F -- (2013, 2014, 2012, 2015, 2011, 2009, 2007, 2010, 2008); KTM -- 250 XC-F -- (2014, 2013, 2015, 2009, 2008, 2010, 2012, 2011, 2007); KTM -- 250 SX-F -- (2009, 2008, 2007, 2013, 2010, 2011, 2012, 2014, 2015); KTM -- 250 XCF-W 4-Stroke -- (2014, 2012, 2015, 2010, 2011, 2009, 2013, 2008, 2016); KTM -- 350 XC-F -- (2012, 2008, 2010, 2013, 2014, 2009, 2015, 2007, 2011); KTM -- 450 SMR -- (2007, 2010, 2008, 2009); KTM -- 350 XCF-W -- (2010, 2012, 2016, 2014, 2009, 2011, 2013, 2015, 2008); Husqvarna -- FE 350 -- (2014, 2015, 2016); Husqvarna -- FE 250 -- (2015, 2014, 2016)