Integrated Engineering Midpipe Exhaust Upgrade - Audi S4/S5 B9/B9.5 3.0TUpgrading to IE Midpipes on your Audi B9 B9. 5 S4 or S5 is an easy and fast way to add an aggressive exhaust note. Superior engineering and quality craftsmanship will ensure a long lasting upgrade for your 3. 0T that delivers fun, and addicting exhaust sounds daily. Located between the downpipe outlets and center resonator, midpipes make up roughly 12 feet of factory tubing and two large resonators. Upgrading this section removes the resonators and