free2D I think some might have misunderstood what you meant.. it tapers AFTER the cat convertor.
If you look at the SPOON Exhaust B-Pipe for DC2 (from their catalogue), you'll notice going into and out of the mid-resonator the piping appears to bottleneck..then comming out of the resonator it increases diameter again before tapering down again for the axle-sextion.
I too was wondering about this as I dont want to spend ~$1k on an exhaust system and find that it makes less power than my old (custom) system..
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