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OK, I'm in the middle of this project and man, that steel is thick!
The Morse abrasive cutting wheels I bought from Ace Hardware at 2 bucks each wear down to nothing in a flat 1-2 minute span. I am just barely making a groove inside that muffler thus far.
Finding small enough grinding wheels to fit inside the muffler pipe is not easy. Tons of big ones are available...and cheap.
I'm gonna find more of the small 1.5 inch x 1/4 inch ones and keep working at it. I'll keep you posted.
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