I've got AU chrome headers with no cats 3" bigbore with a single super turbo muffler half way 3" in and 3" out and 4" chrome tip the sound is bloody awesome and the power is great that is on an EBII XR8
i run advanced extractors, with magna flow high flow cat... 2.5" stainless steal system with one genie turbo muffler..
make sure you FIT A CAT!!! even if its factory.. they make such a tiny difference that its not worth screwing up the environment for, as well as there being a MASSIVE fine if you get caught with out one.
(all it is, is a piece of honey comb style mesh, with heaps up bright red, burning excess fuel and crap, so as you could imagine, unlike the old wives tale it makes stuff all difference, if you must, go high flow)
well there you go!! I didnt know that about new zealand.
BUT i would still highly recommend that you put them on, ESPECIALLY if your in australia!
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