With Earl's Exhaust Gaskets, Earl's Performance 29D03AERL - Earl's Performance Pressure Master Header Seals - Overview - SummitRacing.com, the inserts can be replaced for about 60% of the cost of the gasket price ($18). For those who have used them, do the inserts need to be replaced if the headers are removed, or can they be re-torqued a few times? Is it more prudent to replace the inserts?