A sparky can be adapted to the akra easily enough. I got a FMF model s9000 (I think), and removed the FMF attachment pieces and epoxied onto the akra quiet insert. It should have no effect on the abundant power, passes the stick test, and is easily visible by shining a flashlight down the endpipe. The only downside is that it does not say USFS approved, BUT the stamp on the FMF insert only said "Spark Arrestor" and listed the part number. So unless the s9000 is USFS approved and on a list with the USFS, and the enforcement officer has the list, an FMF pipe owner could be SOL as well.