[Potroast]

those are reasonable prices for a magnaflow cat-back (an actual magnaflow catback, and not one made with just magnaflow mufflers). Quality of magnaflow catbacks is also amazing if you were wondering.

You could probably do this for less if you just purchased mufflers and had a shop fab a custom cat-back for you. If you go this route, make sure it's mandrel bent!!!

I would go for the duals. It looks great, and sounds MEAN! Performance should be great on the duals, and I wouldn't worry about towing. It will likely move your torque curve up a little on the rpms, but towing should still be no problem -- and your top end will be much improved.