BMW M2 v M4 sound-off rev battle
Comparisons between the BMW M4 and its M2 sibling are inevitable. Each has a three-litre straight six but the M4 has twin turbos, 317kW and 550Nm, while the smaller M2 has one turbo, 272kW and 465Nm - yet the M2 is only 0.2s slower to 100km/h (4.5 v 4.3 seconds). Which sounds better? You decide!