VIDEO: CGI be damned! Inside the BMW M3's V8
 

Car Porn...

Nice! I do wonder, is that real footage or a computer animation? Can't really figure out how they'd record inside a complete engine.

It's both. Some macro photography, likely with a very small camera head or fiber scope setup, and some CG, namely the inside the cylinder bit with the charge going off.

A real air/fuel charge going off results in a very small blue flame front, and a whole lot of non-transparent gasses, not the hollywood-type fireball shown.

Here's an image of a real combustion event taken at high speed, I believe from a Toyota engine design manual I had at some point.