Sophisticated, refined, and powerful, all at once. Each cat back system features an H-pipe crossover tube at the front to maximize exhaust scavenging for maximum power, as well as to take a harsh edge off the exhaust sounds. Tubing diameter for the entire system is 2.25". The more civilized of the family is the A4 3.2L Touring Exhaust. This system features front, central and rear resonators to keep overall volume to an acceptable level. AWE resonators are a straight through design to aid in sound tuning without providing any restriction. Perfect for the daily driven A4 3.2L looking for a bit more personality. When it comes to tips, the Touring Edition finishes off with 90mm slash cut tips, featuring the AWE logo, so they know what team you're on. All tips are individually adjustable, allowing depth into the bumper to be set according to personal taste. They're also double walled to ensure a mirror finish - even under hard usage. Lookin’ good!