Atawonetsa BMW Alpina B4 Bi-Turbo Coupé, mphunzitsi waku Bavaria tsopano akukonzekera kuwonetsa mtundu wake wosinthika, BMW Alpina B4 Bi-Turbo Cabriolet.
Alpina, pazaka pafupifupi 50 za kukhalapo, wakhala akuyesetsa kukhutiritsa zilakolako za omwe akufuna kukhala ndi…”wapadera” BMW. Kaya ndi mawonekedwe olimba mtima kapena kuwongolera magwiridwe antchito, mitundu ya Alpina imawoneka ngati "mimbulu yovala zovala zankhosa", chitsanzo chake ndi BMW Alpina B7 Biturbo.
Pofuna kupitiliza kukula komwe kwachitika zaka zaposachedwa, Alpina akukonzekera kuwonetsa "mwala" waposachedwa wa nyumbayi: BMW Alpina B4 Bi-Turbo Cabriolet. Mtunduwu umachokera ku BMW 4 Series Cabriolet.
BMW Alpina B4 Bi-Turbo Cabriolet, monga mtundu wa Coupé, idzakhala ndi injini ya 3.0 Twin-Turbo six-cylinder (N55), yopereka 410 hp pakati pa 5500 rpm ndi 6250 rpm ndi 600 nm ya torque yayikulu pa 3000 rpm. ZF Sport-Automatic gearbox yama 8-speed ZF Sport-Automatic gearbox iyenera kuthamangitsa 0 mpaka 100 km/h m'masekondi 4.2 okha komanso liwiro lapamwamba lopitilira 300 km/h.
Pankhani ya kunja, zosintha zimatsatira zomwe zimakonda mtunduwu, kuchokera ku mawilo a alloy 20-inch, kupyolera muzitsulo zowopsya za thupi ndikutha mu njira yatsopano yowonongeka ya masewera anayi. Kumbali inayi, mkati mwake muyenera kukhala ndi ma logo angapo a Alpina, komanso kusintha pang'ono kwa chiwongolero ndi mphasa zapansi. Payeneranso kusintha pankhani ya kuyimitsidwa.
Kukonzekera kukawonetsedwa ku Geneva Motor Show, BMW Alpina B4 Bi-Turbo Cabriolet ikuyembekezeka kukhazikitsidwa masika.