[RodKnock]

One of the reasons why I'm not a big fan of HOA's.

What do your HOA docs say about noise, etc.? If they're silent on the matter of noise, then you're doing nothing illegal. And as long as you're making an effort to mitigate the noise, like no Sunday 6AM starts or keeping the garage closed upon startup, then in a nice way, I'd say "tough luck" to your neighbor.

There are just WAY too many other things to complain about like too many cars in a driveway, not parking in the desingated parking zones, speeding, speed bumps, trash, landscaping, backyard structures, street basketball hoops, blah, blah, blah.

He or she is actually impinging upon your freedom. And investigating quieter pipes would be a neighborly thing to do too. And I'd mention that to him or her.