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Well after 65,000 miles and the muffler flange rotting out, I finely pulled the trigger on the Magnaflow muffler. I had it welded in to the stock B pipes and added a new stock tailpipe with dual tip.
Looks great! You were smart to convert to a dual input.
If you live in a non-emissions city, you might consider deleting the B cats. I replaced mine with two Vibrant 1792 resonators. With the 2x resonators it's quieter than with the cats and completely drone free, without them, the cat delete makes it louder and it drones pretty good.
I have a 2011. The dual inlet was the same as the stock muffler, 2 in 1 out. When I change out the manifolds I'll switch out the Bpipes as well.
That's interesting, my 2005 has a Y to 1 in 1 out. 2 in has to be better.
Best thing to do with the B pipe cats is delete them altogether if you don't have emissions testing. Even if you do, it is unclear if the manifold cats would be enough. After I deleted them my mileage went up an mpg or so.
With the magnaflow 22", which I think was sightly more restrictive than stock but sounds great, and half the cats gone I can top 20 mpg with best case gas.
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