A throwback to our 2012 drive of Alpina's 335i-based M3 GTS-lite. the curious case of the Alpina B3 GT3. in actual fact it’s half the price and half as hard as BMW’s mightiest M3. The B3 3.3 engine is based on the S52B32 engine from the US-spec E36 M3 3.2 with 240 hp. The cylinder head and the single-VANOS system have more in common with the BMW M50 engine than any M-engine, with a regular M50 intake and hydraulic valve lifters. Alpina increased the bore to 86.4mm as well as a longer stroke (94mm). qZiF.