I cant see a Truvativ Powerspline BB tool anywhere. However, am I right in presuming Truvativ is owned by SRAM, and one of their BB tools will.
Truvativ Powerspline BB - Lowest Prices and FREE shipping available from me an average of at least £10 a year, plus the cost of bearing tools/workshop fees.
Amazon.com: Truvativ Power Spline Bottom Bracket: Bottom Bike Brackets And Installation was easy with the proper tools, and at <$20, the price is right.
According to bikepedia it's a Truvativ Powerspline. you'll need the PARK BBT- 22 BICYCLE OCTALINK ISIS BOTTOM BRACKET TOOL.