ðɪ ˈɛndʒɪn hɐz ɡɔn θɹuː sˈɛvɹəl dɪzˈaɪnz, pɹˈiːviəsli ɪŋklˈuːdɪŋ ɐ smˈɔːlɚ tˈuː.fˈoːɹlˈiːɾɚ sˈuːpɚtʃˌɑːɹdʒd jˈuːnɪt.
The engine has gone through several designs, previously including a smaller 2.4-litre supercharged unit.