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UK writer Nick Hall spent some time in a BMW Z4 that's gotten an V8 upgrade (in Shelby Cobra—like fashion) by German tuning house, Hartge. Known for treating BMW's product line as a mix-and-match playset, Hartage took the 5.0-liter V8 that once M-powered the M5, shoehorned it into a Z4, rewrote its suspension story and kicked it to the curb. The result is the M that Never Was, which may just upstage the Z4M that will be this year. Then again, there's a high price for all that mucking about.

Hartge Z50 Test Drive - Subdued Supercar [German Car Fans]

Hartge s V10-Powered BMW 3-Series [internal]