First let me start by saying that I drove around with the Needswings single cai for 3 weeks before going to the dual intake. and I have to say my findings were a little surprising.

Pros:
looks cool!

very little if any intake whistling compared with the single intake

smoother throttle transition from part to full throttle

a little more midrange power in 1st and 2nd gear.

sounds a little more aggressive

engine feels less restricted.

probably makes a couple additional hp over the single intake simply becuase there is less restriction and a smooth aluminum intake elbow

All in all I like it and I think it's a good upgrade for the money.