Looked at one myself before deciding in the end for a gruppe m! Taken from their website:
Introducing the all new Password:JDM Dry Carbon Fiber PowerChamber Intake for the 02-06 Acura RSX / 02-05 Honda Civic Si. Just like the original PowerChamber from PWJDM, this one makes more all around usable power and has the killer looks to back it up. Dyno Proven 18.1 horsepower gains over base line with no other modifications made to the car. (Dyno tested @ Erick’s Racing by Erick Aguilar on a Bone Stock DC5!); this intake went toe to toe with leading Cold Air Systems and spanked it silly.
Just assuming they are talking about the gruppe m and arc etc when they say leading brands. You do need to buy their battery locator though as stated above which costs about £100!