Im goin to order the doug thorley long tubes for an 08 gt what else do i need to buy? can i reuse the oem gaskets?

I reused my gaskets. You may have to buy a new O2 sensor depending if you can get the old one out or not. I ended up having to buy one because mine was cross-threaded. I don't think that I am alone on this. Others have mentioned O2 extenders, but I didn't need them. The spacer that they provided for my dipstick was drilled too small, so I had to improvise there.