Modding the stock Tailpipe on Wr450F

Hey guys, i noticed as others here said about the tailpipe is so small you cant get your pinky finger in there, I removed it and drilled out the two rivots in the pipe and removed the restrictor insert and welded over the rivot holes, then i cut off all the pipe the extened to the inside of the muffler, is this a good start, while i wait for my ProMoto Tip? is this the baffle people are saying to remove or is this further inside the muffler? BTW my AIS removal kit is on order also.

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