As said many times...it's your car.
If you care about what people think: don't do it
If you dont care: do it
Everyone's gonna have an opinion.
If you started a thread:
A) You care what other people think.
or
B) Want a pat on the back for coming up with this "awesome" idea...
I think re-badging is the worst thing you could do. I think it'd be cooler to get a custom multi-tone horn that'll play 'Waltzing Matilda' than putting GM badges on a (if your car is Gen. 1, partially) Ford. Would you show up to watch Bathurst with Holden badges slapped all over a Ford Falcon? You'd get effing lynched, and you and I both know it.
2008 3 GT Sedan
lol dude, really? sorta ricey idea no offense, same as putting an amg badge on a mazda. talked about this b4at a meet, doesnt make sense. my friend is putting a ford symbol on his kia rio, because hes doing it as a joke, unless u want it to be a joke. imo, bottom line, its ur car, but the majority of tm3ers will dislike this fo sure.
"There is no path to happiness: Happiness is the path " ~Buddha
"And so you touch this limit, something happens and you suddenly can go a little bit further. With your mind power, your determination, your instinct, and the experience as well, you can fly very high." - Ayrton Senna
"There is nothing noble in being superior to your fellow man: true nobility is being superior to your former self" -Ernest Hemingway
I could see it if you had a Pontiac G8 or GTO but slapping a GM badge on a Mazda is just going to result in a lot of people making fun of you.
When I was buying my 3 I nearly bought a Saturn Astra (which I would have slapped Vauxhall badges on). Since Mazda and Holden are totally unrelated and pretty much the antithesis of each other (Holden is all about power and a lot of their cars are RWD) it would look silly.