I just installed a new K&N FIPK kit on the Tundra. So, by my math...
15 extra hp + 10 extra ftlbs of torque - 20 lbs of restrictive factory intake = 1500 lbs more towing capacity!
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2012 Ford F350 Super Duty 4x4
ProPride 3P
2013 Windjammer 3006WK
1973 Camaro RS, LS6/475hp, 6spd
The good thing other than a better sound and a little kick in the pants was cleaning the engine after I found one of our woodland friends had set up camp on the front of my intake. He seemed to have been long gone.
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2012 Ford F350 Super Duty 4x4
ProPride 3P
2013 Windjammer 3006WK
1973 Camaro RS, LS6/475hp, 6spd