7. This is the JBA after-cat exhaust system designed for the '05-and-up Nissan Frontier with a V-6 engine. The system includes all necessary mounting hardware and is designed to be easy to install by end users. We like that it includes a 3.5-inch stainless steel tip and a high-flowing Y-pipe. The system is mandrel-bent from 2-inch stainless steel, or aluminized steel for the budget-minded.