SP11A , we called it the "Street Plus 11A", was state of the art back in the day (late 90's). The exact configuration is tough to know without knowing exactly when it was bought. Judging by the handwriting, its probably a bootleg, (since the handwriting doesn't look like mine)
In any case, those ran fine and are probably not the root cause of detonation, I would make sure your boost is under control and try buying fuel at a different station.
Bob