Do CSU’s like SDSU and CSUF even look at extracurriculars at all or is it purely GPA and test scores?
it is purely grades and test scores.
They combine your CSU GPA and test scores. Read all about it here:
http://www.csumentor.edu/planning/high_school/elig_index_calculator.asp
SDSU usually draws their line around 4100. Fullerton is around 3700.