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Replacing your mufflers isn't going to increase flow that much. The restriction is in
1. the exhaust manifolds (which there is no aftermarket parts for) and
2. the crushed-bent exhaust tubing. Replacing the exhaust cat-back with a mandrel-bent setup wi really help, but it's pricey ($300-400, as mike said).

If you replace the whole cat-back setup, having one or two tailpipes will not make any difference.
 

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Jeg's, JC Wihtney, or any other peformance parts supplier. It will be a set of various bends in whatever sze you order (2 1/4", 2 1/2", etc.). Give those to the muffler shop when you go in, and they will use them where they need them.

I haven't looked at the dual exhaust setup very closely, but I don't think that replacing it will make any difference. there may be more bends, but there is also twice the amount of volume coming out the tailpipes, so the pressures after the wye are cut in half.
 
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