Since I've recently replaced my stock turbo with a slightly used TA60 I've been having reoccuring exhaust leaks at the turbo to header flange and the turbo to downpipe flange. I've carefully resealed both using ultra copper but the turbo to header leak has slowly started coming back. I've ordered Remflex gaskets for both and I plan to sand the mating surfaces to make them as true as possible as there appears to be slight pitting on the mating surfaces. Is it okay to use a gasket between the THDP and the turbo or will it affect the wastegate puck operation? Any other tips appreciated, I've already searched the forum. Thanks guys.