On the other hand, a lot of people will say the opposite - modding a cheapo front-wheel drive Japanese sedan will never yield as satisfying results as saving up your money to just get an M3. Which of course doesn't mean you have to stop with the stock sport shocks because you can get good parts off of Bilstein...or as is closer to the foam mod on the HD600, removing most of the interior to make it go faster. But yeah I kinda agree with you on that one; you strip the M3 and it might get you a few split seconds off your lap times, but the penalties to comfort and practicality personality won't be worth it. If I had that much money, I'd be racing a stripped RX-7, and driving around in an A3. Or at least an Acura.
At some point my foam covers disintegrated but the earpads were still kinda good so I just removed the foam. By the time I got around to putting new pads, I tried them without the cover first, then put them in...hell yeah I never removed them again!