TTi exhaust kit, or haul it to the muffler shop?

3" is overkill and wasted with manifolds/stock/mild engine. Go with a 2.5" kit and there are many around cheaper than TTI if you look.

www.accurateltd.com, Jegs, Summit are a few places that have them.

A good exhaust shop should be able to bend and install a system for around $350 in my opinion. Some may be less or more.