Just ordered a full 3" stainless from D&Tfor my 09 3MPS. Includes turbo dump pipe, 3"stainless metalic cat, 3" cat back system and dual outlet 4" tips total cost is $2400, this in cludes freight to Darwin, fitting, 10 year guarantee, and they detail your car.
Had a similar system on my old MPS from D&T for nearly 3 years with no problems, virtually inaudable at cruising speeds and gave just on 15kw. The bloke at D&T said the new system should give more due to a different turbo on the 09 model [true/not true?]