Quote:
Originally Posted by GP20
How are you enjoying your 3.91?  Maybe the ESS software along with RPI intake/BMC filter will also let you gain back a little MPG that you lost with the 3.91.  |
The 3.91 gears aren't aftermarket - everyone, from diffsonline.com to Dinan to ACS, Hamann, and Hartge simply re-sell the BMW parts. I'm enjoying the gears but the diff has gotten
really noisy - the installer is going to swap it for another unit in the next week. Performance-wise - very pleased, though.
I wouldn't mind the software, but I've no desire for the intakes or scoops.