im runnin extractors and a 2inch freeflow exhauast at the moment and i make it work its arse off. but it is still slow as a wet week. do pod filters/cai/ram air do much for it. im even willing to change cams, leads so on and so forth i just cant afford a engine conversion unless it is pull out and put back in little to no mads required to the engine bay and all the other shit.