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We have inspection stickers on all vehicles in Louisiana. Each vehicle has to be inspected each year, the cost $10.00 per year. They don't check emissions, just things like lights, horn, brakes, everything having to do with safety.
I'm in the process of looking/installing a 4" on my truck. I have to install the muffler. Here in MA they check everything. I could get a sticker by other means but where my trucks are all registered and insured as commercial vehicles I'm not going to chance it when the dot decides to do their checks, and these seem to be more frequent!
No kidding. My neighbor is a Sgt. with the MA State Police. He gave me the # for the commercial truck division. I'll call them tommorow and see what they say. I'll post back with the answer.
A turbocharger is considered a muffling device in some states.
No kidding. Learn something new everyday. Now I know why both my truck and motor home are fairly quiet without mufflers. I always wondered why they were so much so than gasoline engines.