Featuring Extruded Aluminum Oval Canister and Stainless Steel Endcaps, the Turbinecore 2 Is in a League of Its Own. Nothing Offers the Performance Because No Other Spark Arrestor Has FMF's Exclusive Turbine Dampening System. Their HiFlo Technology Maintains as Much of a Straight Through Core as Possible and Performs More Like a Moto Silencer Than a USFS Approved Spark Arrestor. As Well as Being Less Restrictive, There Is No Screen to Clog or Burn Out - the Turbine Dampening System Is Completely Maintenance Free.