Description
Unleash the full acoustic and performance potential of your 3.0T V6-powered Audi S4 with the IE Catback Exhaust System. This system is engineered with IE’s exclusive DroneTrap™ Technology to eliminate unwanted in-cabin drone while delivering a deep, aggressive exhaust note worthy of your performance sedan.
From its mandrel-bent T304L stainless steel construction and hand TIG-welded joints to its 90mm quad slash-cut tips and multi-point reinforced hangers, every component is designed for maximum flow, long-term durability, and head-turning style. This bolt-on system offers a direct fit with no cutting or welding required and is emissions compliant in all 50 states.
Key Features:
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DroneTrap Technology: Tuned resonators cancel out drone for a refined, aggressive tone
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Direct Bolt-On Fitment: No cutting, no welding, no check engine lights
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Quad 90mm Slash-Cut Tips: Oversized, brushed stainless steel tips with aggressive styling
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High-Flow Performance: Dual 2.5” mandrel-bent piping supports any stage of tuning
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Stamped Resonator: Multi-wall construction prevents warping and fatigue
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Multi-Point Reinforced Hangers: Vibration-resistant and rattle-free
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T304L Stainless Steel: Corrosion-resistant, race-ready durability
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Leak-Free Wide Stretch Clamps: Secure, clean seals with OEM-level reliability
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Bridged Piping: Reinforced dual pipes for superior rigidity and vibration control
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Modular Upgrade Path: Add optional midpipes or a downpipe for custom sound profiles
DroneTrap™ Technology
IE's proprietary DroneTrap system features dual resonators that are mathematically tuned to eliminate the resonant frequencies responsible for cabin drone. The result is a deep, enriched exhaust note under acceleration and a quiet cabin during cruising.
Complete Bolt-On Catback System
This exhaust kit replaces your OEM mufflers, resonator, and tips up to the factory or IE midpipes. It’s engineered as a direct bolt-in solution for your B9 or B9.5 S4 with no permanent modifications required.
Quad 90mm Tips – Aggressive & Refined
Take your S4’s rear-end aesthetics to the next level with large 90mm quad slash-cut tips that fill out the factory valance with authority. The brushed finish adds a touch of motorsport style with OEM+ polish.
Optional Midpipes
Upgrade to IE’s Midpipes for even more volume and increased flow. The optional midpipes eliminate 12 feet of restrictive factory piping and resonators, further unlocking the growl of your turbocharged V6.
Built to Last – TIG Welded & T304L Stainless
Every exhaust system is crafted with mandrel-bent T304L stainless steel, hand TIG welded with precision jigs, and reinforced with boxed-in hangers and bridged pipe segments. Built for performance. Built for life.
Leak-Free Installation
Wide-width stretch clamps provide a tight, leak-free seal and ensure the cleanest sound possible—without the rasp, whistle, or loosening common in inferior systems.
Installation
The IE Catback Exhaust installs in approximately 3–4 hours with standard hand tools and access to a lift. No permanent modifications or special equipment required.
The standard shipping rate applies to orders within the continental United States. If you intend to place an order outside of the continental US, please reach out to support@x-ph.com for assistance.
