Would it be wise to use the manifold/header gaskets that come with the obx headers? Has anyone had good experience with them? Or would i be better off getting the fel pro's and not use the gaskets that come with these headers? Anyone have any experience with advise? Thanks.

 

Use your old head to manifold gasket.

And oem 350z/G35 gaskets for the rest.

 

take a look at them and compare them to what came off the car (assuming its OEM). If it seems good enough, run it. If it seems rather unimpressive grab a felpro.