Strange sound, think I need to replace my exhaust. Recommendations?
For the past year or so, my car has been making this odd metal-on-metal rattling when under stress (starting from a stop, very low RPMs, when the AC kicks on, etc.) Around the same time, I also started to lose 3-4mpg in highway gas mileage (not entirely sure if that's related.) I brought it to the dealership, and they identified it as the inner wall of my exhaust pipe rotting out. They offered to replace it, but wanted nearly $2000 for it. So, I'm thinking I'll just do it myself.
Herein lies my problem though - What should I replace it with? I don't think I want straight up stock, but I don't want something completely obnoxious or ridiculously expensive either. Any recommendations?