I went with Rawtek. Downpipe + High flow cat + res. No muffler. The high flow cat won't get clogged with soot. Which is why I'd recommend getting one. To keep ur muffler ull just need to hit up a muffler shop and get a sleeve to go from 3" to stock exhaust OD. The EGR delete, look for Race Pipe. I'd recommend the shorter ones so u keep ur ASV. and if ur deleting ur DPF look at pulling the EGR cooler while ur at it. Made my life alot easier. It's that or u use block off plates and tune out the EGR