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At least in Kevin's, the exhaust bounces off the front of the muffler before exiting out the side. My 034 is a straight shot out the front with the baffle drilled out. Loud isn't the word for it. Powerful too. Bouncing off the front seems to help give the needed back pressure.

I have drilled a number of holes through a baffle and it worked fine. I would consider how much of a hole is getting left by completely removing the baffle. Completely removing it looks like what you are going to have left there is a very open can, and your muffler exit looks pretty large...

The only problem I have ever had with removing a baffle, is when the outer shell outlet is opened up too much, or the cumulative total opening of more than one outlet, then I couldn't get a decent idle without the chain moving. That was the case on an 038 that had a removable inner baffle...