Quote:
Originally Posted by Biginboca
For the diff upgrade the only higher ratio oem diff you can swap is the 3.91 from an xdrive automatic, and yours is 3.73 (if you are rwd automatic). Other options are having a diff built like at diffsonline but that is pricey.
You have a dyno for 280whp, or if not how do you figure that is your whp?
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Does the xdrive diff bolt in. Or is there fab work needed.
I did have a dyno but I lost my phone a few weeks back, go to get another next month anyway