I had a unique situation installing at set of Work Brombacher's on my BMW...so I called an expert. He originally was going to sell me $11 valve stems but he took the time to consult and give advice on my whole setup
After consulting with Julius for all his fitment knowledge, and product expertise and time he spent with me I decided to skip the alternative cheaper vendor I was going to use and order all my TPMS from him as well. Because he earned my business.
What most people forget in this market are valuable company assets to the M3 and aftermarket community. While the knockoff fly by the hip companies will sell you the cheapest, bulk products out there from Taiwan, they won't offer or help with any of this irreplaceable help that people like Julius can offer. Make the right choice and don't purchase by the bottom line price but the whole package of service/customer service/expertise your vendor has to offer. For your wheel needs - look no further then WheelSTO.