After some research and replies from various CT Depts:
Regulation: 22a-174-27
Title: Emission standards and on-board diagnostic II test requirements for periodic motor vehicle inspection and maintenance
http://dep.state.ct.us/air2/regs/mainregs.htm
http://dep.state.ct.us/air2/regs/mainregs/sec27.pdf
When the revised 2007 emission standards are published, appears the 22a-174-27 regulation will be updated: Had not been aware there was a change from 2005 to 2006
"Composite motor vehicles: For 2005 and earlier model year composite motor vehicles, the maximum allowable emissions shall be 4.0 % CO and 800 ppm HC. For 2006 and later model year composite motor vehicles, the maximum allowable emissions shall be 1.2 VOL% CO and 220 ppm HC "
" Note: Starting January 1, 2007 newly completed composite vehicles will need to have an engine that will meet new composite vehicle emissions standards. The standards that will be in effect are equivalent to the two-speed idle standards for 1980 and newer passenger cars and light trucks or 1988 and newer engines from trucks in the 8501 to 10,000 lb. GVWR range. Composite vehicles classified as 2006 model year and older will continue to be subject to existing standards which are approximately equivalent to the two-speed idle standards at a level somewhere between that for 1968 and 1973 vehicles."