B8 Audi A4 Avant Gets S4 Powertrain Swap for Max Performance - AudiWorld

This Audi A4 Avant S4 clone mimics something that wasn't sold in the U.S., and the results are quite impressive.

B7 Audi A4 LS4 AWD swap - LS1TECH - Camaro and Firebird Forum Discussion

Surprise! 4.0L V-8–Powered Audi S4 Sneaks by at SEMA

Audi A4 with a Supercharged S4 Powertrain – Engine Swap Depot

Audi A4 with a Supercharged S4 Powertrain – Engine Swap Depot

Complete S4 Avant Swap Full Build In The States, 3.0T A4 Avant

White Hot Heat: 2007 Audi A4 Avant S line Titanium Package Road Test - AudiWorld

Which used Audi models should I avoid while buying a used Audi? I want a B7 A4 Quattro Avant 3.0 TDI. Is that a reliable car? - Quora

The New 2007 Audi A4 and S4 Cabriolet - AudiWorld

The new Audi A4 - AudiWorld

2009 Audi S4 First Drive: Pray for Rain - AudiWorld

Audizine Forums

Craziest Aero Ever!?! Here's Two Giant Wings with an Audi S4 Attached to Them - AudiWorld

Audizine Forums

My B7 S4 timing chain experience : r/Audi