I did both a Speedmaster set and a slash cut America only real difference is the need to make a nice cut on both pipes that match to remove the taper. It is best to do 1 baffle at a time from the big end being careful not to damage the reducer. I did mine carefully with a 45 degree air chisle normally used to remove car mufflers. I had to make an extension to reach the baffle farther down. But I very carefully worked my way around with short bursts with the cutting part paralel to the outside of the pipe. Once I was done still had the mesh with packing around the outside and no baffles. If you look down inside you can't even tell there were ever any in there.

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