I have heard the sound clip of the HKS hi power catback. It doesn't seems to be too loud from the outside. Can anyone concur? Yet, does the HKS Hi Power drone? I have a Helix catted downpipe, will the set up draw unwanted attension from cops? And will it drones in the cabin of the car? Because it seems to be a very nice exhuast and power gain for about $500; but I don't want it to annoy me when I am just driving around and attract unwanted attension. Thanks for any help.