I have a 91fx with a bisson pitts muffler in one of my planes. Brand new engine and exhaust, broke it in last week. Took it down to the field this morning to set the idle trim and everything in my radio, only problem was the high speed needle had no effect. So I took a piece of a pencil stuck it up one of the exhaust outlets and ran a screw through the exhaust into the pencil, fire up the engine and everything is just about normal again. So I guess the only fix is crimping one of the outlets? Wish I woulda known this before I just woulda spent the extra money and bought a saito 100. Should I crush just one of them, or both of them evenly?