If you think your installer can get the piping routed from that 40477 properly then I guess go for it. I think it'll be kind of a mess, but it's not my car.
With the 40842S and that, you will have a sound similar to FocusBoy58's car (before the header install) and mine. Though it will be much more quiet if you don't have an intake. Those things are real noise-makers even without an exhaust.
Even if you went with only one muffler it still will not compete with a modified old Bug haha! Now those can really make some noise!