There are very few Australian header makers out there, rather exhaust shops that are able to make a good looking header, but very few people that work in exhaust shops arnt that clued up on the science in headers, manifolds or exhaust systems in general, they just throw something together that looks right or similar to something else, they can get around this by testing many headers, but the number of people here just dont allow for the r&d like previously suggested, thats why the states have the rep and experience they do, as do Japan but they are particular in design and testing, stemming from motorsport but i wouldnt apply that tag to all Japenese headers, but some are very good at what they do, some have made that many that they got there performance wise in the end.
The copied headers out of the states are just copies of proven headers like TODA, SMSP, HYTEC, RMF, SSR to name a few.
Unless your 100% in the ability and experience of the person making your header then id suggest spending your money on a copied proven product if on a budget, or get a real TODA, HYTEC, SMSP, DTR/SSR header if after the most from your set-up.
Research and look for examples of headers on engines close to your build to guide you, but it doesnt stop there either, your exhaust system affects your performance aswell.
Good Luck.
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