The standard Z4 bonnet looks kind of bland and fails to match the otherwise dramatic styling of the Z4. BMW made up for this when it introduced the more muscular looking Z4M. The bonnet of the Z4M features an accentuated power bulge, created by two sharp front-to-rear crease lines. The Z4M bonnet perfectly complements the flame surfaced styling of the Z4 and is direct replacement for the standard bonnet. Both are made of aluminium and probably have a similar weight. The Z4M bonnet is one of the best visual upgrades for the Z4 if the performance of your car can live up to the expectations.
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