I have a 2002 1.8t dual exhaust. Basically, the whole pipe is rusting out from the previous owner living in Illinois. I can tell it needs new couplers and a new flex pipe. The exhaust connects to the sides of the mufflers which could also be replaced. Some of the pipe can be reused. My question is, should I invest in a new or used exhaust pipe or just have the pieces that need to be fixed, fixed? What's the best cost/car efficient mufflers to buy? I'm trying to know what I'm getting into before I go to a muffler guy.