hey there mate I noticed you have a full coby system on your vy2,i also live in nz iv got a vz ss 5.7 I have just put on a coby catback but now I want to do coby headers and cat delete.can u tell me about your headers are they 4-1 long or short or are they tri-y?also did u delete cats and did you need o2 sensor extensions when u fitter headers?sorry about the questions its hard to find nz info on this ozzy site haha.cheers Jamie.