havn't been back for a couple of years, new kid job etc. but upgraded shocks, ball joints and tires since then. with exaust go to a big rig shop and get 4 inch pipe. ( my 04 has 4 inch some had 3.5 depends on build date) if you have 3.5 order the turbo downpipe from mbpr or whoever in 4 inch as well as the mandrel bent piece for over axel. then make friends at local muffler shop and loose the cat and any mufflers. my truck sounds like a grey hound bus on steroids. only bad during deer hunting season as they hear me coming 3 miles away.