Called Motofrugal today to ask about the dubach pipes. Apparently they have a new "system" out with a spark arrestor. Anyone know what this is? Is it as good as all the other Dr D. exhausts everyone's talking about, as in just the race can with a sparky in it? Or is this a whole new thing that maybe doesn't make the power? I'm on the fence over Dr D or MRD, I'm looking for more upper end hit on my 07 YZ450, so thinking Dr. D is the place to go, but don't want to try anything new and untested;) Any help??