The 3.0 CSL gets all the love and for good reason, but the standard 3.0 CS is a delight in its own regard. The torque—of all the preconceived notions I might’ve had about the 1973 BMW 3.0 CS ...

While BMW is working on a brand-new M2 CS, this tuner just gave the previous generation a whole lot of power and other upgrades. Do you like the spec?