Do I need studs or hardware to bolt this to my engine?

This manifold assembly only. You'll need OEM exhaust manifold studs or equivalent fasteners for engine mounting — those typically stay with your car or come with your gasket set. Verify stud count and size before ordering.

Can I use this manifold with any T25 or T28 turbo?

Yes, if your turbo's turbine inlet is a T25 or T28 flange, it bolts directly to this collector. Double-check your turbo's specifications to confirm inlet size before committing.

Do I need to ceramic coat or wrap this before installing?

Not required. Stainless steel resists oxidation and handles heat well on its own. Ceramic coating or wrapping is optional and depends on your engine bay setup and preference for underhood temperatures — it won't hurt performance either way.