I've drilled out the air holes in a couple of Evods. With that modification I was able to up my watts to 15, where 9-10 had been the highest I could go without burnt taste earlier. Didn't notice much of a difference in draw though, but wasn't paying much attention to that. I haven't tried to drill out a 510 atty though, and I'm thinking that would be a more delicate procedure than with Ego air holes.
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