Exhaust rusted out changed to dual two questions.

[PGG]

Ok so I backed out of the drive a few weeks ago and the exhaust system had rusted out and had to be replaced. Took it to a local shop with a great referral and went with a dual exhaust and flowmasters mufflers. Its a bit too loud for my taste especially since its a stock sub 200 horse power engine. In Texas we call that all hat and no cattle. He also routed the pipes out behind the rear tires on each side. In my mind I always remember them coming out the back.
Is there a right way and which one is it if so? What should I ask for him to change the mufflers to so its not soooo loud? I like a little rumble but its annoying how loud it is right now. Opinions and suggestions please!
Thanks PG