Martin, I understand what your saying but I have a full engineering workshop with everthing I need, so for me to that would be too easy. The turbo, wastegate and manifold mods cost me $1700 so about the same as a s/h HKS turbs and all my stuff is like new now. I have already modified the stock plenum already but I was not happy with the stock insides, dont think it would flow evenly. I will use the bottom runners and make a top half, easy. The intrcooler core is only $500 so it is better and cheaper than a GTR. The only reason I want to use the Haltech is it will do a good job and will give me somethink to play with and moniter things. I really just want to try and do something different and learn something other than bolting bits on ( I am doing and Engineering degree at uni).