Actually, the power gains in the DC sports JDM header are much more significant than the stock JDM header. If you want to see a really impressive header comparison test, with dyno charts I would go over to superhonda.com and go to the discussion board in the Type R area. It's a sticky post that has many headers tested. The only headers that produce more hp and torque on a dyno than the DC sports JDM headers are the Spoon, Mugen, and SMSP headers...all of which cost over $700. They averaged just about 19 hp to the wheels, and the DC sports averaged about 17 hp. I would recommend the DC sports JDM header as I have been very happy with it's performance, but I would also recommend getting a Carsound race cat to go along with it. Either way....good luck!