What intake manifold do you have?
I gained power and tq when I switched from a SRI to a CAI on the RBC, granted it was about 2whp so its not like I noticed it but I would run the CAI, its going to keep your IATs down which means more air + more fuel = more power.
I wouldn't recommend using any form of air box if your trying to make power they are restrictive I dont care what tests were done its all BS, you want the smoothest flowing intake pipe possible.
Edit: Not sure what the injen pipe diameter is but its best to be at least a 1/4 larger than the diameter of your TB. My piping is 3" going into a 68mm TB.
I gained power and tq when I switched from a SRI to a CAI on the RBC, granted it was about 2whp so its not like I noticed it but I would run the CAI, its going to keep your IATs down which means more air + more fuel = more power.
I wouldn't recommend using any form of air box if your trying to make power they are restrictive I dont care what tests were done its all BS, you want the smoothest flowing intake pipe possible.
Edit: Not sure what the injen pipe diameter is but its best to be at least a 1/4 larger than the diameter of your TB. My piping is 3" going into a 68mm TB.