I e-mailed Renntech and gave them the business for not providing any hard facts for the claims they have posted. Here is the response I got:
Mr. Cook,
Sorry for the delay in reply as I have been out of the office. I have followed up with our BMW tuning department and while we do have a tune for the N63 it is only for the X5. Our tuning does not apply to the F10 and numbers listed for the X5 are not applicable to your application.
Sorry for any confusion and wish you a happy holiday weekend.
Feel free to contact me directly should you require anything further.
Regards,
Mark Hatfield
RENNtech_logo_120711
1369 N. Killian Drive
Lake Park, FL 33403
Phone: 561-845-7888 x116
Fax: 561-845-6777
mhatfield@renntechmercedes.com
www.renntechmercedes.com
So, apparently they can flash tune the X series, but not the F series. Sounds like crap to me. I've searched high and low for anyone driving a N63 that has this tune and have found nothing. Personally, I wouldn't waste anymore time trying to get information from these guys, but that's just my two cents.