Remember that the 601 probably aren't "standard cast"... Here is BBS's information on casting techniques:
http://www.bbs-usa.com/bbs-technology-expertise.cfm
Quote:
Every technology has a limit. Cast aluminum wheels were a big improvement over the steel wheels, however when it comes to performance, there are other technologies like flow-forming or forging that surpass a standard cast wheel. These higher level technologies will allow a reduction in weight (while maintaining the stiffness and durability) that will improve vehicle performance.
Current BBS aftermarket designs that benefit from the "Flow Forming" process are CH, CH-R, CX-R and SV. BBS supplies cast flow-formed wheels for many high performance OEM manufacturers including: BMW, Audi, Ferrari and Porsche. Also, some factory racing programs from BMW, Ferrari and Ford have selected a BBS cast flow-formed product specifically for track use.
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A forged wheel is usually better than a cast wheel, but it's not like they are bad... This type of wheel construction is the most commonly used by manufactures and have a long history of durability and strength. It's not like the 601 is manufactured with some unknown process where we should expect the wheels to fall apart on a frequent basis...