Airbox mod for gen 2?

Yes, which one are you talking about?

Ram-air seals, Carbon box, larger box, short stacks?
 
As for a "free" HP mod (like gutting the gen 1 box, or removing the flap) there isn't one for the gen 2. You could shorten your center 2 throttle stacks but all that will get you is a torque drop in the mid-range and 1-2hp up top. Not worth the loss of throttle response IMO. Ram air seals are about $100 shipped and you won't feel a difference below 150mph, the carbon box is $1000 and is good for a couple of hp, but at the cost of not running an air filter (you could just pull the filter from the stock airbox).
 
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