^^ Agreed. I've owned two of these and done alot of work on them. B20a5(USDM version) and B20a(JDM version) are both not really in the B-series family. Most parts are not interchangable. I have seen GSR/B20v swaps in them but I don't believe anywhere makes a swap kit. In order meaning that you would have alot of custom fabrication in your future if you decide to follow through with the build. I would say completely rebuild your motor and if you're wanting more power to just through together a custom turbo setup. If you're wanting more power without boost, I know people have used bike carbs to custom do ITB's. Also, if you can locate a DC sports header, DO NOT hesitate to buy it. They're discoutinued and hard to get your hands on. So, just keep all that in mind.