I am replacing my HKS gt30r exhaust manifold due to cracks. I have a direct replacement. My car has the full HKS GT30r turbo kit. The question is, which gaskets do you think I would need to replace while I have it removed.

If anyone is familar with this kit, do you know if the down pipe gasket to O2 dump is the same as OEM?

As of now, I need to buy a exhaust manifold gasket and downpipe gasket. Do you know which website has fast shipping? I need these in by next friday! Thanks.