I'm selling one of my K2s, s/n 3155, which has the following options installed: KNB2, KAF2, KSB2 & K160M. I purchased this K2 in Dec. of 2002, and built it in 2003.This K2 was built with the K2 toroid kit from "The Toroidguy," AA3WF. Price is $750, including shipping. Email me at w2vd<at>arrl.net or mross<at>email.com if interested. Tnx & 73 de Mike, W2VD