my suggestion is keep saving for a complete system: Up-pipe, Turbo back exhaust (DP included), turbo, injectors, fuel pump, bigger Intercooler, IC hoses, sparkplugs, and protune.
'06 does not necessarily need a new up-pipe, or at least that's my understanding from reading some of the posts regarding '06-'07s (anyone correct me if I'm wrong)
If your savings rate is modest, then I'd consider the TBE first (even though personally, I'd start with suspension, tires/wheels, etc). But don't rely on my opinion alone, there are plenty of threads that can be searched (try keywords: turbo, upgrade, exhaust, stage 1, stage 2...), or find someone's car profile that you like and search their posts.
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Last edited by sleepr; 08-03-2008 at 11:40 AM.
Reason: up-pipe not needed? and bolded items are installed together