I had a few issues with my thorly header leaking. I installed a remflex gasket. I had to drill a hole for the egr, but that was no big deal. It did fix all the issues.
Here is the address
http://www.remflex.com/It was around $32, definately worth the money. I did put antisieze on both sides of the gasket, in case I have to take it off.
