I put fmf universal spark arrestors on both our dune 150s and they are way loud in a bad way and without back pressure killed the performance. I just today got done making a tail pipe with a smaller tube 3/4 inch inside diameter welded to a washer and welded to the huge 1 1/4 stock tail pipe opening. Will try it out tomorrow and post some pics.
We went to Gorman in June and they require usfa mufflers or a possible 1,000 dollar or more fine so I heard. So for 105.00 a piece it was worth it just way to loud. I tried to rivet tail pipes on and had good success for the first hour until they vibrated loose. When I had to remove the tail pipes the sound was crazy loud with no power, we haven't been ridding sense but getting ready for this fall.
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