Are you looking to buy a car but can't decide between a BMW M8 or Porsche Cayenne? Use our side by side comparison to help you make a decision. We compare design, practicality, price, features, engine ...

Crucially though, BMW promised it would be fun to drive too. As such, for the next in our Deadly Rivals series, we thought it only fair we compare the two. We've got a Porsche 911 Carrera 4 GTS up ...

And the Porsche 911 is still picking its wounds a little, the new 991-generation car beaten in its debut group test at the start of 2012. A spec table comparison fares the BMW well, too.

preventing it from living up to the grand touring expectations of its body style — and making the M8 a tough buy in a world of Lexus LCs, Bentley Continental GTs, and Porsche 911 Turbos. BMW has ...