Actually I realized I took .3 mm off the intake, not 3mm, lol. I forgot about the matching of the intake to the port, I'll be sure to do that. I've read though that if you make the intake rougher, it allows for better atomization of the gas/air particles. The exhaust though has to be as smooth as possible. FYI, it was actually the fast cylinder I started with, the reason it's looking the way it is is because I've only been using a dremel, I'll bust out the files and flatten everything. Maybe I'll do a before/how not to have it look, and a after/final product, lol.