I've heard of using the Ultra Copper on the GASKETS to seal `em up nicely. I've never heard of using it on the threads tho.... Plus if your using a quality header with a thick flange you'll have less issues with leaks. Cutting the flange between the tubes seems to help *some* people with leaks that are running thin flanges.
Or just keep the wrench in your glove box and get used to it.... :happy4: