Me too. Went to the fuel and air section of the how-to articles, but it wasnt there either.
Oops. Original post from three years ago.
Edit: best general info i have found; if you have a single plane intake, use a four hole, if you have a two plane, use an open. But whether to use a half inch, one inch, two inch (if you have room!), four hole tapered to open, plastic, wood, aluminum, etc, i have never seen any firm recommendation, cause there isnt one. It depends entirely on what YOUR combo likes.
I suggest experimenting with the cheapest, widest assortment you can get. Could be the cheapest horsepower you will ever buy.
