[s-cars] Cordless Impact Wrench - Recommendations?

[Bruce Mendel]

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For next year's track events, I've decided to treat my back and lower spine to a cordless impact wrench.

I've done some research, and this seems like the best deal on the best wrench:

http://www.powertoolservices.com/tool_section/9079-72.htm

But it does seem heavy at 9 lbs. Some of the others are 3-5 lbs. This one breaks up to 240 ft/lbs, which is awesome. Some of the others rate torque in inch/lbs (divide by 12 to get ft/lbs??).

Anyone else have a recommendation to share?

My back thanks you in advance.

Bruce
93 S4