Ive been searching for this hardware high and low and found some interesting information. The fasteners that come with our F46 Tial wastegates (direct bolt on) are not stainless as one would think, but titainium. I looked up the prices to these bolts and they are costly. This earns Tial even more respect from me because I see the quality of vendors they use and from a business point of view it is costly to implement hardware like this in their products. Hell yea!
