I'm currently in the process of upgrading the front brakes on my V6 4Motion to 344mm R32 brakes. To do this, I need a new set of discs. My local motor factors are coming back with silly prices for front discs. I have done a quick ebay search and can get cross-drilled and grooved discs (Mtech or similar) for a fraction of the price of the factors. Is this because the local factors are trying to rip me off, or the 'upgrade' discs on ebay are shonky quality? Does anybody have any experience regarding ebay brake discs? The car is mainly used for spirited road driving, and track days. A