When we changed turbos on the Sierra Sierra EVO to the BorgWarner EFR, we took the opportunity to test out some Turbosmart Comp-Gate40 wastegates. It wasn't too much work to make the change from the TiAL MV-S since the Comp-Gate40 is a direct retrofit with the MV-S. There are some minor differences as far as fitting threads go (see below), but if you are using rubber hose for your pressure connections, the Comp-Gate40 is a 100% retrofit to the MV-S.
The decision was made to switch over to Turbosmart components at Sierra Sierra because 1) TS offered a high quality product that performed well in testing, 2) TS offered a better support program for the EVO and 3) a valve guide material issue with the early MV-S wastegates caused Sierra Sierra to be slightly concerned. TiAL did fix the problem immediately for SSE and we never had a failure again, but the Turbosmart Comp-Gate40 did offer some additional useable features. I should mention here that I currently use both TiAL and Turbosmart wastegates just like I use both Garrett and BorgWarner EFR turbochargers. By writing praise about the BW EFR turbos and Turbosmart Comp-Gate40 wastegates, I'm not saying that I dislike Garrett turbos and TiAL wastegates. In fact, I just used a TiAL MV-S wastegate and Garrett GT30 turbo combination without a hitch on the BMC Tool Racing Panoz DP-02 at the NASA 25 Hours of Thunderhill race. There's plenty of space in the marketplace for multiple brands of quality products. I think the competition needs to stick together. The enemies are the legions of factories cranking out poor quality copies in China.
Aside from some of the trick features of the Comp-Gate40 I discuss below, it has all of the good features you would expect from a quality wastegate: cast stainless body, anodized hat and base, stainless heat shield to protect the diaphragm, a ultra high lift diaphragm, cast stainless body clamps, stainless weld flanges, stainless hardware, etc. Turbosmart is big on Rotary engines in Australia and turbo rotaries can produce exhaust gas temperatures near 1900 degrees F in some instances. How's that for product testing? Anyhow, here are some of the trick features.