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1. Upgrade the headers 2. Knock out all the cats in the system --> This one is a bit tricky because of the new laws around catalytic converters, which states that any car registered in NZ after 2010 that was manufactured after 1990 has to have a catalytic converter in the system. If you legacy was NZ new in 2006 then you can take all the cats out and still get a WOF. If it was imported after 2010, then you'll have to do the less legal thing of finding someone to knock the guts out of all of your catalytic converters and leaving the empty cats in place so that it still looks like you've got them in the system to get your WOF. Best to cut them open, remove all the filling, then weld them shut again as opposed to knocking the guts out with a metal pole. If you're not keen on doing this, then 1 high flow cat will suffice ($150 from Redline) I found an image of the stock exhaust system that shows where all of the cats are below. 3. Remove the mid system muffler (labelled number 24 in the image) and replace it with a resonator (you can get a 2.5" one from Redline for $60) as this muffler does NOTHING and removing the cats will increase the exhaust noise a little and putting this resonator in will deaden the sound again. If you prefer to use a high flow cat, use this instead of the resonator. 4. Leave the stock mufflers in place. They do restrict flow a little bit, but not much and they kill a hell of a lot of noise. Pic below Headers + all other work should cost you less than $1,500 to do. Then you can get onto the Romraider forums and research tuning unless you want to shell out another $1,000+ to have it dyno tuned or find someone to reflash your ECU for less This should help with another 20 - 30kw and make the car feel a fair bit more torquey (I had a tuned 30R with exhaust done at one stage and my wife had an untuned one and the difference was quite noticeable).