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To be deadly honest, in terms of hp gains, exhaust provide minimal improvement. i believe is was 2-3kw at rear wheels at max improvement.
In terms of exhaust i believe it produced a nice sound, a deepish tone.
In terms of performance it will be roughly around the same as many exhausts out there, if you do a quick search in the forum you will see that many people will only get a few kws outta exhaust, but the sound always makes the butt dyno feel faster.
If you get it done at RX8 Specialities down in Carrum Downs it should be around 100bucks or so, tops.