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Nice man! I dont think I'd ever build an STi again....its really not worth it. and look out! '06 are known for having ringland detonation issues, so I'd definitely at LEAST have it tuned...even bone stock, have it tuned. the OEM tune is absolute shit..its not as horrible as the stock Evo tune...those are just disgustingly rich with too much timing in the works..
The STi OE tune is better on fueling than the Evo, but definitely would benefit in both power/torque/throttle response and MPG from a tune..
If you have a Wideband (preferably an Innovate) I'd be happy to street tune you if you're close..or if not, for a Beer and some grub? :P
but yea...reason I say, is because....15k stock everything...this happened to cylinder #4..
http://img193.imageshack.us/img193/3...ted4piston.jpg
its a well known problem on '06-'07