I have used these for a few years. With the head change I bought another set. I ran the car for about 5 minutes total and I have to remove the header on one side. The gasket delaminated so I wasn't too happy, with tax they are about $40. I sent Remflex an email last night explaining what I had done and expressing my displeasure of having to spend another $40 after thinking the engine never warmed up so the gasket should be good to reuse. I got an email this morning saying they would warranty the gasket if I had my bill to show it was a purchase within the last 6 months. I was surprised cause I never asked for a warranty since it was my fault and there is nothing on the literature about being able to reuse the gasket. They do say that satisfaction guaranteed so they really stand behind their word, it really does help to buy US made products. The gasket set is on it's way so I'm happy....
http://catalog.remflex.com/aboutus.asp
http://catalog.remflex.com/aboutus.asp