It's in my build thread, basically you cutoff the stock air box and slap on a filter using the stock MAF housing. Here is a thread about it LOL, warranty. Airbox/Intake mod
^ that's the stock system. #10 is your second CAT #12 is your res #13 is your muffler. I would start with just cutting off the muffler if thats what you're thinking. I did it right after the hanger just before the muffler, after a few weeks i wanted to be louder so i unbolted the flange between the cat and res and i am currently running it open at that flange.
I have noticed some Blackish spatter around the areas where my exhaust is open so keep that in mind.
Also maybe Eric could chime in but i dont know if there is a replacement for the mid pipe (#4) available yet
you will have to cut the muffler off to get it out anyway, i would start with that and see if you get enough of the sound you want. going with no res is loud i mean really loud, you probably won't like it at first.
Assuming you are talking about the portion where the flex pipe is, no, there isn't a bolt in portion for sale. You can go to your local whatever they decide to be and get one made for you.
-Eric Smit
So am i correct in assuming that's the only stock portion of your exhaust or have you replaced that as well?