Quote:
Originally Posted by pony
I too would be interested in this. From everything I've read/researched, 3.70's in the A6 is the way to go. I've considered buying the 3.91 complete diff for around $1200 and dropping in, but feel this would be just too much. However, LPE has the market on the 3.70's and at $600 plus install kit, Plus install in another pumpkin, I'm guessing I would be looking around $1700+.
Then you have to get a custom tune for the speedo change vs the GM one and that's IF It'll work on the A6 vs the Manuals.
With all of this said, 3.91's may be worth a second look even though the highway MPG would probably suck.
I would also be interest if anyone has put a M6 3.45 diff in the A6. Might be a acceptable money to performance compromise.
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3.45's are perfect for FI. I feel that, although, the 3.91's are ~$300 less, that 1st gear would be useless, you would be tractionally impaired with street tires and your gas mpg would be 2mpg less. Also, I am not a drag racer and will not run a TC. I think 3.70's would be the best ratio for a N/A A6. IMO