Do I need new gaskets and fasteners to install this?

The header itself comes as the assembly only. You'll want fresh header gaskets and stainless steel fasteners rated for exhaust heat — don't reuse old hardware. Most builders grab a new gasket set and ARP bolts while they're at it.

Can I bolt this straight to my stock exhaust system?

Yes. This header is designed to connect directly to your factory or aftermarket exhaust piping. No adapters or modifications needed on the outlet side.

Will I need to tune or datalog after installing this?

A header alone won't throw a check engine light — it bolts in mechanically. That said, pairing it with tuning work optimizes the gains. Talk to your tuner about whether your existing tune or ECU program needs adjustment for the new exhaust flow characteristics.