Does the tinny, trunk-rattle sound good from the inside of the car?
For the most part, you don’t hear the rattle from inside the car.
I wouldn’t know, since I’m not the sort of insecure, overcompensating, small-cocked, self-absorbed asswipe who would have the stereo cranked up loud enough to cause the tinny trunk rattle.
Maybe it’s just me, but I always laugh my ass off when I see/hear someone drive by in a cheap car with a state-of-the-art sound system. ('Tis especially funny if the car is a beater.)
Dunno - but I’d hazzard a guess that it doesn’t matter. The din is for your consumption, not the cars’ occupants.
Setting Otto’s comments aside, it is difficult, if not impossible, for the occupants of the vehicle to hear the rattling going on from the trunk while driving. This isn’t an excuse for not being aware of it, however. There are insulation mats that you can have installed in your trunk that will go a long way to prevent the unnecessary rattle.
If you’re going to spend thousands of dollars on your stereo system and crank it up loud enough to annoy the folks around you with your music, the least you can do is spend an extra hundred or so to keep folks from hearing your distorted music.
One of the funniest things I can recall seeing in recent memory was someone driving a very old, beat up Toyota Cressida (or something very similar to it), with all four windows rolled down, blasting his music. You could, quite literally, hear him for blocks. The sound was crystal clear, though, and he had obviously spend a LOT of money on his sound system. What was he playing?
Smooth jazz. 
Dude, if it was Smooth Operator, you might have witnessed the coolest person ever.
Sade could live a million lifetimes and never come up with a song as sweet as that one.
Not only do the occupants not hear the rattle they don’t hear much of anything. Music at that volume distorts the ear drum.
I’ve had cars rattle my house windows a block away and put me in the category of people who think the owners are self-actualized jackasses. There’s no satisfaction in the knowledge that they will damage their hearing. It’s just sad.
My sister in law drives a Jag, and was enjoying the cool weather we had earlier this year (she had the windows down). Guy pulls up next to her at a stoplight, blasting the most gross rap you can imagine (fuck the cops, shoot the white ho’s, etc…). She’s listening to a jazz tape, and reaches over to turn it up so she can hear it over the shit. Asshat responds by turning up the crap.
Lesson learned: Don’t try to outplay someone in a Jag, unless you have more invested in your sound system that you have invested in your car. Also: trying to outgun a Jag in a Neon makes you look really stupid.
The guy that invents a “clicker” that lets you silence the annoying boom cars will be a very wealthy man.
Wait…so the OP isn’t about Mr. Limpet?
Now THAT is funny!
I like my music loud, as y’all may have gathered from my previous post. But I like it loud for me, and not to piss off others. I am very conscientious about turning my music way down at intersections where others have their windows down, or when driving through residential neighborhoods.
So I take a great deal of pride in doing precisely what SnakesCatLady’s SIL did when some moron pulls up next to me at light, grinning because he thinks he’s blowing everyone out of the water with his system.
Sorry to disapppoint, but it was an instrumental song (may have been Hiroshima, now that I think about it). I would have preferred a good Miles Davis tune myself, but one can’t always be picky. 
You just described my husband’s last car. The thing was falling apart, but is sounded great on the inside. Outside the rattles and vibrations would make you seasick. It was a very “pimp ride” as my hubby puts it.