I have the TF P-47 with the G62. I'm running a Zinger 22x10 with a stock muffler. The muffler has 3/8 pipes (about 2 inches long) welded to the holes in the muffler. I removed the straight sided carb stack. I'm geting just 6000 RPM. I have tried all the tuning tips but 6000 is the max. I have heard of folks pulling out the baffles in the stock muffler. Is this doable, worth doing? I'd like to keep th muffler because it fits the hole in the cowl. I plan to try a 20x6x14 as suggest above. But any other info would help.

thx
/colin