You are not invincible with your New RD or STi.
You may find yourself driving faster than before your recent purchase, but I think you're falling into a sense of false security.
My suggestion is to keep the speed in check for the 1st couple of months, and see how your RD responds... in your surroundings... where are the falses in your area or on your commute to work etc etc.
Remember, not all patrolling LEO's have their radar on.... I've come across some traps in the city where the STi has remained silent, and the cop's been sitting in the cruiser just observing traffic.... If you're noticeably quicker than the flow, you could be in trouble. I've driven thru 2 traps in city limits this week where the cops just been observing traffic without radar on.
I've also seen moving cruisers where radar hasn't been used.
Remember... keep your eyes open!!!!
Drive safe, Drive Smart