Diffsonline is involved in motorsports at all levels, from HPDEs (High-Performance Driving Events) to entry-level amateur racing to full-on professional race teams. In order for our products to be the absolute best on the market, we test everything in the most rigorous fashions. This can only be accomplished safely on a race track. Our BMW differentials are proven week after week under some of the harshest conditions any car will ever see. Take a look below to see how we are involved.