Dude, at the end of the day, your a peasant in the system.
The cop is the "almighty tax collector" and were just the peasants who pay the taxes, look at it like that and you will realize that any modification is classified Illegal UNLESS it's ADR.
If not ADR, it is defectable but hell i don't care about ADR shit anymore, if you don't bend the rules slightly, you'll never enjoy life!!

Have no fear driving with modifications (just don't drive like a dick) and you should be right!!
Cop's don't generally pull you over UNLESS you've done something wrong OR your asking for the attention.

Trust me, i know this.
Lost my license twice and im well on my way to my third suspension in just 2 years of driving so i have the experience to tell you (not saying that my record is a good thing, but the things you learn and the way you deal with cop's come in good use though =))
By the way, never received a defect though LOL...