I think turboed cars tend to show sooty pipes a lot anyway as there is always a bit of over-fuelling around town or when on and off throttle, such as on winding roads. It's only on decent runs I see my pipes starting to grey up nicely but still much more dark with carbon than I ever see in non-turboed cars I drive or have driven. But you shouldn't be seeing smoke, unless you've been staggering along baulked by poor road conditions, and then get a chance to plant it, when it will maybe puff once (black smoke, not white) as it clears itself up and gets going nicely.
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