You'll get more response if you post in the correct section.
Thread moved.
The most cost effective and most reliable solution is to sell the N/A and buy a Turbo model... After that the next option as far as lower cost and reliability would be a GTE swap... Sorry, but that's the truth, bummer. The N/A isn't built for it and to get it where it needs to be costs a pretty penny... To get the performance from a N/A that you'd get from a 7M-GTE costs about twice as much per HP. Take some time and search through the MKIII and MKIII FAQ sections; Like you said this has all been covered in significant detail in the past and few of us are up to the constant repetition.