I'll second (or third or whatever the count is) Remflex gaskets. I have some on my Yukon and they don't leak at all, the stamped steel ones the headers came with leaked about 5 minutes after I installed them. The Remflex ones have been in there for three years no issues.My only suggestion at this point is to use remflex header gaskets. The OEM style gasket on my 22R, leaked the day I installed it. I swapped it for a remflex based on what other yota guys suggested and I'm super impressed with them. They're twice as thick, you torque it down to their specs, not the OEM spec and it crushes about half way. I'll buy a set for Daisy one of these days, one of hers leaks slightly when the engine is cold.