might add my input,
first off i drive a type r with a k+n intake and hks exhaust, (loud)
something similar happened to me, the difference is i was being a knob (admittedly) exiting a roundabout in fist gear, topped out at 40mph (speed limit) passed the fuzzies on the opposite side of the road, they followed me to work.
similar story, claimed i was speeding at 55mph, i explained 1st gear takes me to 40mph, i would have to be in second gear which takes me to 60mph. he instantly dismissed that and asked me ALL the questions, where's the car kept, address, registered keeper, tax, valid mot, when did i buy the car ect, then they asked me about mods, of course i told them what i had on the car. and they failed to find anything on me, however i was polite and calm, took them seriously. the threatened me with anti social behaviour, of which i apologised and they let me on my way.
if you buy a loud fast car, expect that you will be looked at more, you pay to play.
being a bus driver, driving 50+ hours a week on the road, i see 1 in 10 cars average that are fast or "modified" and most of them drive like knobs. although in my area in Guildford, i see a lot of civic ep3's and they're obnoxiously loud doing 60mph+ on 30mph roads.
loud cars attract attentions, i rarely see amg 45's on the road, so if the police were to see you accelerating in the manner i did, they should rightly pull you over, regardless of the speed limit.
i see it the other day, I'm stopped at a narrow "T" junction in a double decker bus, cars parked on the left hand side, i had to take the opposite lane to get round this sharp corner, there are 2 cars on the left of the "T" junction indicating to come into the junction, and a car coming down the hill from the right of the "T" junction. this white estate Mercedes overtakes the indicating cars almost hits the oncoming traffic and then almost crashes into my bus, he claimed he didn't see the indicating cars. the real reason was because he was driving like a knob, and almost cause thousands of pounds of damage.
moral of the story is speed kills. i *own a type r, know your limits.
edited to correct my typos.*