if you are doing the muffler still in the sled you have to do the top. You cut out the crossover tubes inside the muffler. Then weld the 2 layer skin back closed. I have done quite a few if you have a decent welder it takes about 2 hours start to finish.
To honest there is no gain in HP and the sound is not as great as a GYT R Dun pipe from Hauck and the sound really burbles in your helmet.
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