Timing Advance Key??

[HCR250X]

I was wondering if this will give anymore power to my 400ex and if they were worth the money. I found a Curtis Sparks one on ebay:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=43977&item=2454768711&ssPageName=STRK:MEBWA:IT

[Ralph]

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