My Indy says BMW parts only

[Helihover]

It's because they have the choice. The choice to do it right. They also have way more knowledge on installing parts than you or I, so there could be a lot more to this than installing cheap parts.
If you worked in an industry that was of the higher end, would you use cheap/non oem parts to fix your system? Hell No! Cheap parts go on cheap cars and nicer parts go on nicer cars. And....... You gotta pay to play. If you wanna play and not pay....... DIY!!!