Putting this here since it applies more to racers mounting & discmount wheels alot.

HarborFreight is basically giving away these impact wrenches. If you don't already own a compressor or want something portable these things work great.

http://www.harborfreight.com/cpi/cta...emnumber=92798

Note, they won't really torque anywhere near 220 and you'll break the gear inside if you try going over 120-150 for a long period of time. For the $$ it's great though.

 

also look into this Cummins one, which is what I have. I doubt it goes to 240lb-ft like it says, but it has worked well all season for wheels on-off at events and loosening various car parts. Doesn't have the power of a buddy's Snap-On impact, but it also costs 20% as much:

http://www.cumminstools.com/browse.cfm/4,1281.htm

 

that's an awesome deal on the HF unit... I think I paid about $100 for mine at the beginning of the year.

also, I highly recommend buying a spare battery and get the extended warranty.
when I bought my impact wrench on sale, the batteries were also on sale at a similar discount... plus, the 2 or 5 year extended warranty was only like $20 and is a small price to pay to be able to take this thing back every few months and get a new one- or swap out the batteries for new ones right before the warranty expires.