I recently researched this topic myself because I just had the Invidia CBE installed last week and I have the Stillen Gen3 CAI going in next week. From what I have read, the overwhelming consensus is that no tune is needed with just these 2 mods. My car is running excellent since the Invidia was done last week so I know for a fact no issues there. Now once you decide to do the HFC's or Test Pipes along with the new exhaust and CAI then a tune will be needed. 2 bolt on mods will not require a tune. Of course getting one would be great but it is not necessary. I've spent hours researching other threads on this forum and other sites so take that for what it is worth.
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