Can someone tell me if the stock cats are built into the exhaust manifolds? Or are they after the manifold?

If they are on the manifolds, does the Greddy TT kit include new cats?

Thanks

 

They bolt on to the headers.

 

yeah I dont think the Z has a manifold technically... isnt that only for turbo applications? or is it a synonym for headers.

either way, they are bolted on both sides, between the headers and the exhaust sections. so they can be swapped without any cutting or welding.

greddy does not replace them to my knowledge.