ProPower Diesel 4" Muffler KTM 390 Duke NOTE: You do not need

NOTE: You do not need to remove the handle from the Packout tray to insert the CST

This allows for the use of a coolant bypass system

Properly Scaled to Match the Size of Your Truck - Rather than using the archaic “one-size-fits-all” approach

Injector upgrades are required to help increase spool up and performance with this kit

ProPower Diesel 4" Muffler KTM 390 Duke NOTE: You do not needProPower Diesel 4" Muffler By Donaldson. This muffler is a straight through design that reduces drone without increasing backpressure or reducing horsepower. This muffler will fit with any 4" kit on the market including race pipes and full 4" exhausts, but will require cutting to fit.