Originally Posted by MagKarl

You need to do some research with the CT authority in charge of emissions testing and find out exactly what they test for and how. I live in WA, and have to go through emissions testing here to get registration renewed. In my area, for diesels they measure tailpipe gas opacity only, no sniff of the gas composition. Our limit is 40%, I scored an 8, it's just another fee basically, I don't see how anyone here could fail with a decent running rig that's stock or with a stock setting on a chip. Find out what you'll be measured by, and then you can make sure your rig complies.