Automatic vs 6 speed Standard
Plus A4s are easier on the rear, something the M6 guys are capable of breaking stock.
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Short answer: you'll notice a drop in mileage in city driving, but highway mileage will stay the same. "streetability" is different for everyone, but i imagine a 3600 would be very streetable, given that there's a lot of daily drivers around with 4k stalls. but that's pushing it.
a 2600 stall is practically useless, anything lower than a 3k i would not recommend. 3200+ is usually a good idea.



