I'm going to be replacing my muffler with a FM muffler. Specifically, what extra parts (tubing, ect.) will i need to complete the job?

 

Make sure you get stainless Flowmaster otherwise you will be doing this again in a few years. Magnaflow or Borla are better choices. Magnaflow comes with the tubing from the catalytic converters to the muffler, but am not sure about Flowmaster (assume they are compatible),
FF

 

Are you just replacing the muffler?

 

yes, the pipes on my D are perfectly fine as they are. im purely doing this for improved sound

 

I would just buy the muffler and take it to a shop and have them cut out the old one and weld in the new and be done with it! Should cost but $50 bucks max for them to do it.