I installed an Ebay wastegate on a local 2.3 4 cylinder that makes 510 at the wheels at 30 lbs of boost. He's been running it for close to a year with no issues. It is an exact replica of a TIAL. The reason its so much cheaper is because they didn't do the R&D on it, they copied the design, they also don't need to make that much profit since they are a Chinese based company and their economy is very weak compared to ours. So if they make a couple of US dollars profit, that's alot to them.

With that said, I am against buying chinese knock-off's because I believe China is setting themselves up to try and take over the US in a few years, and buying parts from them is only helping their cause.