Thanks again for all of your help, fellow SAU members. I have finally managed to track down what the initial issue was (after sorting out the boost controller). I ended up replacing the spark plugs with a .08mm gap, and put in my mates oem coilpacks (that weren't warped like mine), and the car seemed to run better then, but I was still having the same issue. So, I took my car to a dyno for a diagnostics run to pin point the issue. Upon being on the dyno for approximately 4 minutes, the guy said that I was having 'major air issues.' He suggested that it may be intercooler piping, as the guy who did the 25 swap in and hook up, looks like he just used any scrap pieces of intercooler piping he could find. In retrospect, having a look at the joins very closely made me realise that there may have been some dodgy seals on the intercooler piping, so I went and purchased a universal intercooler piping kit and got to work. Once I had the front bar off, and started pulling pipes to exchange and cut to get good seals, I finally got to the pod filter. What I hadn't done (until this point) was look at and check to see if it was blocked. Upon taking it off, I realised that when the guy I purchased the car from painted the front bar, he didn't mask off the air cleaner! More than half of the pod filter was blocked by paint overspray... At this point, all piping was put back on with better seals in the joins, and a new pod filter installed, and everything runs like a dream. I can rev all the way up to redline, and do it with the pedal to the floor, without her missing a beat! Just thought I'd put a solution to the initial question in the thread. Thanks again guys and girls.