I like fast cars and fast motorcycle, but I hate obnoxious ones. For any street/strip car there's no reason to eliminate the catalytic converter or mufflers. Because the sound is largely about the resonance of the pipe length you can have exceedingly fast cars producing lots of horsepower be reasonably quiet especially at idle and residential speeds.
I had a heavily modified trans it was very fast It was a street legal car that I also took to the track for racing. It did have some technically off-road parts like long tube headers and other things that provide performance but it still had catalytic converters and mufflers. Between idle and about 3,000 RPM it was only slightly louder than stock not obnoxious at all above 3,000 RPM usually in the 5,000 to 6,000 range it sounded like it had an open exhaust system due to the residence value of the exhaust piping.
So anyway your neighbor is a jerk just to be a jerk and I would begin to lodge complaints with the police until they send someone out there especially if they leave for work at the same time every day and pull them over. Same thing for those Harley-Davidson idiots that want to put on straight pipes.