SiR Modelcars on Instagram: "BMW E21 Alpina C1 2.3 1980 red - Solido / 1:18 / @solidomodels / S1812803 The BMW E21 Alpina C1 2.3 builds on the 323i platform but sharpens it with Alpina’s methodical engineering. Its 2.3-liter M20 inline-six receives a reworked cylinder head, revised camshaft profile, and optimized ignition and fuel delivery, raising output to around 170 hp. The torque curve becomes noticeably flatter, giving the car more usable mid-range thrust. Suspension upgrades include firmer