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Message: [QUOTE="TARM, post: 422193, member: 578"] They were not designed specifically to deal with surge. They were made for a slightly different compressor map curve. They were used first in the OBS which AFAIK predates the SD turbo. This wheels map curve just happens to help eliminate surge in the SD. My understanding which certainly could be wrong that after this was discovered vendors wanting to fill/capitalize a need starting offering them as the wicker wheel. Its the same wheel as that which was used in the OBS factory turbo. It should be pointed out that while its said to fix surge it actually only MAY eliminate or reduce it or not have any by the driver noticeable effect on the issue. The only thing that seems to have eliminated surge consistently is the ported comp housing such as that offered by purple people. Not exactly cheap and why so many try the wheel first. IMO many do the wheel swap for the main reason to get more turbo whine or whistle. IMO this is a age related thing i.e. 16-21 maybe more in some cases LOL [/QUOTE]

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