There's a fair bit of fitting and some Dremel work in the FMIC fitment. Allow a good day just for that alone. To get it all done and tidy, I'd allow a good workshop and two guys who know what they are doing a good 2 days. I've done both myself and I am OK mechanically, but there are issues which are not apparent in the instructions, to both DP and FMIC fitment, such as easing the aircon lines around the LH headlight to allow the FMIC-TB plumbing to fit properly, just as one example. Also the CS kit provides a stupid tapered end to the TB inlet line that does not accept a silicon hose properly and which has to be cut off and replaced with a new parallel end welded back on. If you need more details, PM me for my phone number so you can call to discuss.
BTW, both OEM DP's are a bitch to remove, whether a 3 or a 6.
CP_e Standback & PNP; CP_e 3" SS Downpipe; Corksport FMIC with Top-mount K&N filter & OEM Ram CAI; Turbosmart BOV; Dashhawk; Prosport Boost Guage; JBR solid shift bushes; DBA 4000 Wiper-Slot front rotors; Hawk Ferro-Carbon HPS Street front brake pads (@ 69,000km); Sumitomo HTRZIII's in 225/45 x 18