Re: extractors on standard exhaust
You would be better off going with a cat back system first or do it all together. Extractors on there own will make little or no real power or volume.
As for the rear section, just do the whole lot, it will and should cost around the same.
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AUII XR8 (200kw), Silhouette, Body Kit, Hawk Wing, 5 Speed man, Premium Brakes, Premium Sound, Genie Extractors, 3" exhaust with twin 3" tips, K & N filter with air scoop, Polished Inlet manifold, MAF & 70mm T/B, T series interior handles & Gear stick ring, Chequer plate, Momo Pedals.