I have done a fair amount of searching for 2008 X3 performance parts. Lots of searching, but little finding.
-Dinan advertises no current model performance parts. Also, they will not divulge an email address.
-No Borla exhaust system available.
-No Supersprint exhaust systems listed.
-No intake systems of any kind.
-No software that I could find.
-There may be some European parts, but couldn't find anything concrete and none of the various websites I contacted ever bothered to respond.
-US websites selling BMW performance parts had basically nothing and responded that there was no market that justified development.
-Some limited parts may be available for early models.
If anyone finds anything for a 2008 (I think it is the same motor as the 2007), please let me know.
2008 BMW X3
2006 Porsche 997 2S Cabrio