I put my tips back on and the drone is back. Albeit at a slightly higher RPM. I'm going with Dynomax Turbo's. BTW....Engine Masters did a shootout on muffler sound/TQ/HP testing on under $40 mufflers. They tested no muff, Turbo, Chambered and flow through style. The Dynomax didn't make the price cut but it was still interesting. I believe the Engine had around 450HP.
