Thanks for the suggestions.
Wot about a replacement management chip? i hear they're good for about 15-20kw which is roughly 25hp and can be retuned to suite further upgrades. Can someone suggest a brand that has been proven to perform well?
Also, is it worth replacing the airbox with a pod type filter? Does doing that upset any sensors etc in a ke24de? Or would u guys just recommend changing the existing paper filter with, say, a K&N (or similar) re-usable wet element filter. I do a bit of country driving so i feel this may help.