With only 25 units ever built, the 1998 Mercedes-Benz AMG CLK GTR is definitely a rare item that will draw the attention of car collectors from all over the globe. The mechanics and engineers from AMG reportedly worked non-stop to deliver this beauty in time for the FIA GT Championship.  Its mid-mounted 6.9-liter 630 horsepower M120 V12 engine gives it an impressive exhaust note, according to experts.
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