Yep. ECU-boost is allowed in SP. I believe the solid motor mount would also put you in SP, although the latest Fastrack proposes loosening that rule a bit in ST* classes.
Granted, a fully prepped SP car can be practically un-streetable... but a lot of regions are running SP-Street Tire classes for guys running cars not quite so heavily prepped.


which i am going to something like this
this is my down pipe/o2 housing the one on the left side is my o2 housing the other one is the rest of the downpipe.
(not my car)