It depends on what "a little" means. None of my waste gates leak at all if I pressurize the valve side or the dome.
My neighbor has some cheap system he bought on ebay and his leaks....but it still works OK.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)