Audi A4 Sedan 2007-2011 vs. Audi A4 Estate 2012-2016. Compare car dimensions (length, width and height) vs. street perspective.
Evolution Racewerks A4 (B5) Competition Series Front Mount Intercooler (FMIC) Kit
Front Bumper suitable for Audi A5 8T Pre Facelift (2007-2011) RS5 Design - CM Carcosmetics
2007 Audi A4 Brochure
Audi A4 Avant
UPDATED: For the Avant buyers, here is a comparison overlay of B8 A4 and current A3 and A6 - AudiWorld Forums
Audi A4 Dimensions 2012 - Length, Width, Height, Turning Circle, Ground Clearance, Wheelbase & Size
KYB Shocks & Struts Strut Boots Rear AUDI A4 1995-06 – Hobby Shop Garage
Audi A4 - Wikipedia
Steering wheels Size Chart – Carsoda
All-Wheel Drive Systems Compared