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It really depends on which gaskets you have. In a 2000 you probably have the correct gaskets. The gaskets you want have round exhaust port. Starting around 2000-2001 they started using a oval port gasket which may not seal good on headers. I always order gaskets for a 1999 coupe and always get the correct round port gasket. By the way, the factory triple layer steel gaskets are the best header gasket you can get. Don't use those crappy fiber gasket that lots of manufactures ship with their headers. Those fiber gaskets will seal good, for a while....
As far as AIR tube gaskets, it the old ones looks good, I would reuse them. After all they are really easy to change if they ever leak.
It really depends on which gaskets you have. In a 2000 you probably have the correct gaskets. The gaskets you want have round exhaust port. Starting around 2000-2001 they started using a oval port gasket which may not seal good on headers. I always order gaskets for a 1999 coupe and always get the correct round port gasket. By the way, the factory triple layer steel gaskets are the best header gasket you can get. Don't use those crappy fiber gasket that lots of manufactures ship with their headers. Those fiber gaskets will seal good, for a while....
As far as AIR tube gaskets, it the old ones looks good, I would reuse them. After all they are really easy to change if they ever leak.