Are you sure about the amount of power you think your loosing because I think you just might be hearing some different sounds rather then actually loosing any real power. I don't know of any real lose in power from any muffler that is on the market today. all the ones you have tried are performance mufflers & I really don't think you could really tell any real lose of power but maybe some difference in sound. Plus taking the X-pipe off as mentioned it won't make any real change in the drone but maybe in the sound . Plus the Thrush mufflers are made like a straight through muffler , & if you look at the design of them you would see how the insides work & perform.
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