This would be my first time installing a header. This is probably a dumb question but Do I need new gaskets and locknuts? or can I just reuse the ones I have. I have 30k on my car right now. Any tips of installing it? thanks.

 

Gaskets are not too expensive & I'd get a new one. You shouldn't need new locknuts for the block install, nor for the cat-end, but as they can sometimes be finicky to get off, it wouldn't hurt to have an extra lying around.

 

you can reuse the exhaust manifold gasket without a problem

 

The gasket at the head would be ok, just be sure to have a new one for the tail end of the header.