TB Porting is Easy!!
The SOTP change would have a lot to do with the !cats, I think i remeber it being worth 5 - 10 HP.
I did it all with a dremel and sanding wheels. The trick is LOW pressure on the wheel or you will smooth it out very quikly. I used 60 grit to remove most of the material, then 120 to smooth it out some more, then 400 grit sheet of paper by hand. The stone bit didnt work for me either, just got gummed up.
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