Ive used a lot of impact wrench's in a past job as has all ready been said the air wrench needs a big supply of air the two stroke ones are very good but pricey and a bit of over kill for wheel nuts really a Makita three quarter drive would be right for the job you can pick a new one up for about 380 plus vat. Its all so worth getting a 240v rather than 110v as they are stronger.