Will these fit under my stock exhaust manifold heat shield?

Shorties sit lower than long-tube headers, but test-fit before final installation since heat shield clearance depends on your specific bay setup. Some owners modify or remove the shield—refer to installation guides for your model year.

Do I need a new O2 sensor or exhaust gasket set?

Stock gaskets can fail during removal. Pick up a fresh header gasket set before you start; O2 sensor reuse depends on condition—inspect the connector and sensor tip before reinstalling.

What torque specs should I use?

Refer to your vehicle's service manual for proper fastener torque. Over-tightening header bolts can crack the mounting flange, so work methodically and use a calibrated wrench.