I have a Tial 38mm wastegate and when I bought it it had a big sticker on it that said unleaded fuels only if I wanted to run leaded fuels that I would have to get a different kind of valve what ever that thing is called that opens in the wastegate that looks like a big valve. They said the lead would stick to it and make it were it would not work right.Originally Posted by NevrNufTorq