I used to live in NJ.
Common tricks to get around an emissions test with an old clunker are: Pull the vacuum advance on your distributor. Pull your PCV valve. Another guy told me to put a bag of mothballs in the air cleaner.
If you pull the PCV valve, the engine will idle a bit high. When the inspection technician bitches about this, just slip the car in gear when he isnt looking! This worked a few times for me.
These tricks did not work on one particular car I owned, so I used to take it to a shady mechanic with a state inspection license, and slip the guy a fifty. Passed every time!
Emissions tests are a scam. I cannot afford to buy a new vehicle every five years, and I did not want to dump hundreds of dollars into a vehicle that is only worth hundreds of dollars!
Screw the bastards, find a way to MAKE your vehicle pass the test without spending the $$$.
I am now a member of the USAF, and my home of record is Florida. Florida used to do emissions testing, but no longer does, besides, I was expemted from this requirement if my vehicle was out of state.
So as long as I am in the AF, I never have to have my car inspected, no matter where I live in the US. One of the fringe benefits of being in the military!