Why 16V? I can understand the N/A part, but NA 16v just seems hopeless. When you look at the cost of ITBs on a 16v(20V ITBs, 20v to 16v adapter plate, Breather's, etc) You're a couple hundred dollars away from a complete 20v silvertop swap, that already has ITBs.

Bill Sherwood's Modified 4AGE Page

That link will really put into perspective how useless the 16v 4a is when it's NA. And how much money it will take to get to 200hp NA.