I'll be installing a cat next week. (a nice fuzzy calico ) No really, I'm going to weld in a Magnaflow just after the DP, and get tested here in Colo. Hopefully I'll pass and be ready for Mass. My glass is all good, the car is track worthy and leak free. Any other safety things to be prepared for ?
They don't tail pipe test here, they just read the ECU. You should be fine catless, as long as you don't have any CEL's and it's not really loud.
I think the cat will quiet it down some. I'm installing so I won't have to worry about tail pipe sniffers, if I end up in a state that does. Depending on the employment situation, I could end up in MA, NH, VT or NY. How long do you think I can get away with flying my N.M. tags for (in Mass) ?