ZJ31

Hey all, I'm a stranger here. I'd first like to thank everyone for all the posts and replies, they helped me out a lot. I own an 84NA, and i have some big plans for it this summer. whole new suspension I'm thinking KYB or Tokico Shocks/Struts and Eibach Springs. K&N airfilter, maybe the Stanza or 240 TB and finally exhaust. This is where my question lies. I'm planning on straightpiping my car and I want to know whether I should plan on getting new headers to matcht the 2 1/2 inch exhaust tubing I'm planning on using, also what kind of muffler would you all think would give me themost horsepower for the dollar. I'm thinkin $100 to $150 or so. Thanks for all the help.
Stranger, Newbie,
Jonas