This summer i plan on going turbo on my d16, and i was wonderingh what type or exhaust i should look into, i was either going to buy the thermal research 3" catback, or buy a turbo muffler and have a shop do the piping for my exhaust, my questions are.... 1) Should i go with the muffler and 3" mandrel bent exhaust? or buy the thermal research? 2) If i go for the custom exhaust, what kind of muffler should i get? all i have seen is the apexi turbo muffler. 3) What kind of cat should i use? and where could i get one, 2.5" inlet, 3" outlet, or should i go with a test pipe?