no regrets - Eurowise exhaust - Gen 1 V10 Spyder
Initial cold start is pretty loud, wouldn't want it next to a baby's room, but never had a neighbor complain. Have had a few looks of approval as I drove down the alley afterward.
Top up and windows up, no problem with phone calls. They can hear it in the background, but it doesn't interfere with them hearing me or me them (using bluetooth through stereo for calls).
Top down or back window down when accelerating... it makes the noises that remind you why you love the car.