Well, like one of the earlier, more serious posts said, please don't badge your car with something that people would typically get for having a distinguished company modify their car.
Like rebadging it as a 316 or something, yeah, that's all fun and games, but when you throw ///m in there, you're tarninshing the M-group. If you throw Hamann, then you're tarnishing their name. AC, Dinan... etc.
In other words, by badging your car as something that it's not, you're unintentionally destroying the reputation that some companies have worked long and hard to earn. This is why most enthusiasts don't like people who rebadge their cars in a distasteful way.
Debadging isn't so much looked down upon, because it insults no one. Why don't you try something to that effect - not debadging, but rebadging in non-specific ways; like changing the blue/white roundel with a red/white or gray/white, or putting on clear corners and a euro front license plate to get that european look? That way you aren't insulting any company, but you also look more than stock.
Well, I'm not so sure about the euro plate, but that would make you look well-traveled I guess.
1998 BMW e36 M3 Sedan
Crap, I think I may be a yuppie...
2003 MINI Cooper