Do I need to remove anything else to install this?

This is a catback system, so your factory catalytic converter stays in place. You'll unbolt the existing exhaust downstream of the cat and bolt this in. No welding or cutting required.

Will I need any extra gaskets or clamps?

Mounting method and hardware fit are not specified in the product data. Test-fit the connection points to the catalytic converter before committing to installation—you may need factory gaskets or additional clamps depending on your car's condition.

Is the tip polished or does it need finishing?

The tip ships polished stainless. No painting or prep work is needed—it's ready to bolt on and go.