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The debut of the Z4 Concept Coupe, which will officially be called the Z4 CS when it goes on sale in the summer of 2006, happened only a week ago in Frankfurt, but http://www.germancarfans.com/spyphotos.cfm/spyphotoid/6050920.001">GermanCarFans has already posted spy shots of the production version, possibly a high performance M version. The car in the photo has 19x8-inch spoked wheels that will be fitted exclusively to the M coupe, as well as four round tailpipes that usually signify M levels of performance. The site says it expects the M version of the Z4 CS will get the E43 M3 CSL engine tuned up to about 410-420 hp. Though the roof of the coupe will add some weight, we assume BMW has a special blend of exotic lightweight materials to offset the added heft.

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BMW Z4 Coupe Concept in Frankfurt