Originally Posted by bcredliner

I purchased a red with beige interior 2013 X5M for my wife in June of last year. She does not want me to do anything that could impact reliability. However, I sold her on performance software based on greater economy and smoother acceleration when driving normally so she was fine with the extra performance. It does accelerate smoother and it did increase the mileage about 2mpg and did increase the performance. Software specs are 77HP and 85 torque gains. I purchased the software from Turner Motorsports. I kept my X5 4.6 and am still doing mods. I have made some improvements to nitrous system and in early December I will be installing lower ratio diffs.