A good Header and glasspack are always good. It its too loud, you're probably too old.
But if it really is too loud, you can throw a resonator tip on it, or an actual resonator before the muffler. You can get a good straight through one that won't hurt your flow.
As far as bolt on systems, if there are any out there, they'll probably be expensive. Last time I had any exhaust work done, it was $150 to bend and weld everything, that included collector and hangers. I just supplied the muffler. So if you can get roughly the same price, you can pick up a glasspack for around $25 at almost any autoparts store. So if you're just replacing pipe and muffler, you should be able to do it all for around $200. A header, resonator, etc. will be more of course.