The rear differential is very weak compared to the 06+. Secondly if you buy a M6 drivetrain, youll have to keep it in reverse while the car is off, for some reason when the car is off and not in reverse it still thinks its on and will drain your battery. This is something they fixed with the 06+.
I did a lot of research before buying, 05s were bad, 06 were better but 07 seemed to be when they got their chit together.
Also if you go with a A4, least you have better options of tranny upgrades..only one person atm has the A6 upgrade and he doesnt tell much of what hes done to it to make it worth 3k dollars.
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Beware the snake bite.....
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