Hi Barry,
Yes, the wastegate is 46mm in diameter, but it only works when it's open. So far I don't think it's opening, but I could be wrong. I'm hoping it's just a matter of adjustment. I'll tweak it down a little more in the morning. The main exhaust is 3 inches, and the wastegate exhaust is 1.5.  I do have a blow-off valve set at around 50 MAP.
John