What size is stock exhaust pipe on 97 Pontiac grand gt?

The stock exhaust pipe size on a 1997 Pontiac Grand Prix GT isn't consistently documented as a single diameter across its entire length. It's a system with varying diameters. You'll find the diameter changes from the manifold to the catalytic converter and then again from the catalytic converter to the muffler and tailpipe.

To get the precise sizes, you would need to:

* Measure it yourself: This is the most reliable method. Use a caliper or measuring tape to determine the inside diameter at various points along the exhaust system.

* Consult a repair manual: A factory service manual specific to a 1997 Pontiac Grand Prix GT will likely list the specifications.

* Check online forums: Enthusiast forums dedicated to Pontiac Grand Prix might have discussions where owners have measured their exhaust systems.

Keep in mind that minor variations might exist due to manufacturing tolerances.