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Regarding custom fabrication of a header exhaust from a stock "parts-bin"; you may want to start with a set of 993 headers then...My understanding is that they offer significantly better flow over the stock 964 and (I have not tried) should mount directly with little/no modification to your existing set-up...Depending on how involved you want to get
The other opption is to do a web search for "964 exhaust/ headers" there are a lot of fabricaters (besides Fabspeed) and some nice straight pipes at reasonable rates, that bipass the cats and secondary mufflers going straigh into a single, double, or x-pipe cross over set-up...they'ed bolt on and look to be pretty mean ;-)
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