I can't see an exhaust leak either. And I've thought about putting some heat shield on the cowling, but there is almost no room between it and the turbo; about 0.75 in I believe. I'm afraid that an additional constriction would leave even less air to flow past the turbo. I may install an additional air vent in the front to direct more air between the cowling and turbo.
As far as TIT goes, I had a TIT gauge installed last week and will hopefully test it tomorrow. Any suggestions on what temps are normal and what's too are greatly appreciated, since this is my first turbo airplane