2017-2019 For Audi A4 S4 B9 Diffuser With Large Dual Tailpipe

Quick Specs and Highlights

• Diffuser Profile: Aggressive rear valance design with integrated diffuser strakes
• Plastic Grade: High-grade ABS plastic or carbon fiber (see title for spec)
• Outlet Design: Tailpipe openings sized for factory and aftermarket exhaust tips
• Fit Method: Bolt-on using factory rear bumper mounting locations
• Components: Diffuser panel plus exhaust tip surrounds included

Product Overview

A rear bumper diffuser conversion for the . The diffuser panel replaces the stock lower bumper section, adding a pronounced rear lip spoiler profile with integrated exhaust tip cutouts. The design matches RS-style rear-end aesthetics.

Key Features and Build Quality

• Crack Resistance: Constructed from automotive-grade plastic that handles exhaust heat and road conditions.
• Surface Guard: Gloss black coating is UV-cured for resistance to sun exposure and car wash chemicals.
• Bolt Accuracy: All mounting tabs align with factory rear bumper attachment points for a gap-free fit.
• Exhaust Frame: Exhaust tip openings are precision-cut to center factory or aftermarket tailpipes.

Vehicle Fitment and Compatibility

• ✅ Compatible: 2017-2019 Audi A4
• ❌ Incompatible: B6 (2001-2005) / B7 (2005-2008) / B8 (2009-2012) / B8.5 (2013-2016) / B9.5 (2020-2024)

💬 If you are unsure about product compatibility, please send your Vehicle Identification Number (VIN) or front and rear photos of your vehicle to us for verification.

Installation Notes

• Unbolt factory lower trim. Position diffuser and fasten at all points.
• Ensure even panel gap along the full bumper-diffuser seam.