But the BMW M3 E93 ain't a regular family car either with its 4.0 litre V8. The Audi is probably some newer (2009?) A4 B7 or B8. I don't know why, but I've always liked diesel engine Audis (driven a Q5 and a Q7 once before and regularly drive A6 Avant C5), must be because my mum has one, meh.
But this sign is Audi asking BMW to top their 3.0 TDI engine (has 3.2 too I think), and BMW responds with their newest and fastest 4door racing car, BMW M3 E92/E93.
I'd honestly go for the Audi and a diesel, more economical for my wallet also.