I always seem to just grab the biggest impact wrench I can, but sometimes that's not what's needed. For smaller jobs that require as much torque as possible, the M12 High-Speed Ratchet really shines and this new High-Speed version is even better than before. With 40-55 ft-lbs of torque depending on selection, it should speed up the process of getting the bolt threaded and torqued, including the ones on those darn Corvette headers.  They make 7 of these things in various sizes and lengths.  I think this one would be my 4th choice.

My order of purchase would likely be: 1/4" Fuel Extended, 3/8" Fuel Extended, 1/2" Fuel Ratchet, this 1/4" Fuel Ratchet, and finally the 3/8" Fuel Ratchet.  I know many like the regular, non-fuel version due to the smaller head size, but I never find myself using those.   

Specifications

⅜” Ratchet:

• Kit SKU: 2567-22
• Tool Only SKU: 2567-20
• Fastening Torque: Up to 35 ft-lbs of max torque
• RPM: 0-450
• Anvil Type: 3/8" Ball Detent
• Head Profile: 1.1"
• Length: 11.1"
• Weight: 1.7 lbs.

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