just a heads up im doing the same thing to my turbo gsr...im selling the Mugen and going to a 3 inch, as of yet theres two major options for us because even greddy and hks dont officially make the exhaust for our application, you can get a Thermal ( nice exhaust, not too loud ) or go to a place like LHT and get John to make you a custom 3 inch exhuast piping, and then buy whatever Muffler you want ( get one thats known for being quieter) and do it that way...thats just my two cents!