I asked this question myself and to why is the pw more expensive. By a lot, The Plaz turbo inlet pipe is a mandrel bent pipe, with silicon joiners at each end to connect it to the turbo and air box. The PW inlet is a one peice moulded silicon pipe, from the turbo to the box. So no joiners. I would imagine this is more expensive to make. I will be going the PW intake with the Plaz battery relocation which is also a fair bit cheaper than the PW one. Nizpro and Rapid also make them. Do not even price the Nizpro kit if you think the other companies are expensive. You will have a heart attack. Haha