Check out Vlad147's thread on AU Zclub website ... he went Frozen Boost IC because the Stillen kit is marginal as soon as you move away from the baseline setup.
Whether the A2A suggestion is economic in terms of import costs to AU or whether you can take the idea and build it up with local components is one question to consider.
Be careful about test pipes as you are facing into a $22K EPA fine if you are caught without cats and it is easier to get caught in NSW as you have an annual pink-slip check don't you - otherwise test pipes need to come off annually.
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