Will this pass a state emissions test?

Yes — this converter meets federal emissions standards and is designed to pass OBD-II diagnostic scans. Your vehicle should clear any emissions-related fault codes once installed and the engine computer has cycled through its monitoring routine.

Do I need new gaskets or fasteners to install this?

You'll want new gaskets at the mounting flanges — don't reuse the old ones. The bolts typically reuse if they're in good condition, but inspect them first. Grab gaskets and hardware when you order if you don't have spares on hand.

Can I install this myself or do I need a shop?

A competent DIYer with basic hand tools can handle it — you're unbolting the old unit and bolting the new one in place. The tight space under the car is the main challenge. If you're not comfortable working underneath, a shop will knock this out in an hour or less.