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Magnecor leads were a big help on my 8 valve N/A. I used the 8mm ones and they really surprised me. An open air filter will help but the JR ones are much better valve than the ITG offerings with similar or better performance. I can't remember the MOT rules on cats but it has been much discussed here. You could try fitting a rising rate fuel pressure regulator - get one with a gauge and be prepared to adjust it to keep it right. This should help with throttle response but is a little controversial - some swear by them, some swear at them.