Stabilizing headers to the engine?

The Remfelx gaskets are only a six month guarantee aren't they?

From the Remflex website:
We’re so confident you’ll love Remflex exhaust gaskets that we back them with a 100% no-questions-asked satisfaction guarantee! If you’re not completely satisfied with Remflex exhaust gaskets for any reason, return them within six months after purchase, along with proof of purchase and receipt, and we’ll either replace them or give you your money back!