Ngemva kokwethula i-BMW Alpina B4 Bi-Turbo Coupé, umqeqeshi waseBavaria manje ulungiselela ukwethula okuhlukile okuguqulekayo, i-BMW Alpina B4 Bi-Turbo Cabriolet.
I-Alpina, eminyakeni ecishe ibe ngu-50 ikhona, ibilokhu izama ukwanelisa izifiso zalabo abafuna ukuba ne…”special” BMW. Kungakhathaliseki ukuthi ukubukeka okugqamile noma ukuthuthukiswa kokusebenza, amamodeli e-Alpina avame ukubonakala "njengezimpisi ezigqoke izingubo zezimvu", isibonelo sayo i-BMW Alpina B7 Biturbo.
Ukuze kuqhutshekwe nokukhula okuye kwenzeka eminyakeni yamuva, u-Alpina ulungiselela ukwethula “igugu” lakamuva lendlu: i-BMW Alpina B4 Bi-Turbo Cabriolet. Le modeli isuselwe kwi-BMW 4 Series Cabriolet entsha.
I-BMW Alpina B4 Bi-Turbo Cabriolet, njengenguqulo ye-Coupé, izoba nenjini engu-3.0 Twin-Turbo six-cylinder (N55), ehambisa angu-410 hp phakathi kuka-5500 rpm no-6250 rpm kanye no-600 nm we-torque engu-3000 rpm. Ugearbox onamagiya ayisishiyagalombili we-ZF Sport-Automatic kufanele uvumele ijubane ukusuka ku-0 iye ku-100 km/h ngemizuzwana engu-4.2 kanye nejubane elikhulu elingaphezu kuka-300 km/h.
Uma kubhekwa ingaphandle, izinguquko zilandela okujwayelekile emshinini, kusukela kumasondo angu-20 inch alloy, ngokusebenzisa i-aggressive body-kit futhi egcina nge-four-way sports exhaust system. Ngakolunye uhlangothi, ingaphakathi kufanele libe nama-logos amaningana e-Alpina, kanye nezinguquko ezincane zesondo lokuqondisa kanye namacansi aphansi. Kufanele futhi kube nezinguquko mayelana nokumiswa.
I-BMW Alpina B4 Bi-Turbo Cabriolet ehlelelwe ukwethulwa embukisweni wezimoto iGeneva, kulindeleke ukuthi yethulwe entwasahlobo.