I'm glad everyone likes it! I've run into a lot of skepticism, but overall everyone is very happy with them once they relent.

The holes are all 3/16". You could enlarge it up to 15/64" (that's what mine is). It was found that 3/16" or 7/32" was optimal for SVT's.
My idle wasn't affected, but I did notice that it doesn't jump up the revs as high on initial start.
-Lance