Started in late ‘05 running Yamaha Senior Can at NCMP. That was the “introductory” package at the time, and there was some decent racing to be had. The following year I moved up to their “Spec Tag” class, which was a nice transition into higher horsepower, again with pretty strong fields and a range of talent levels. 2007 was the year that things really blossomed, running some National-level races pulling double duty in Tag and Yamaha. Lots of ups and downs that year, but made some really nice strides. That was also the year when I really started getting A LOT of seat time (practice/test days), and it made all the difference.
Continued with various Tag things through 2009, and then in 2010 I bought my first shifter kart. From there forward I was (and still am) convinced that shifter kart racing is pretty much the cat’s ass, and I’d do it literally every day if I could 
Ironically, next year will be a bit of a recalibration year for me, as I’ll try my hand at X30 Masters…should be a fun challenge.