I was not able to find the exact # of Freshman applicants that enrolled in UCSB Engineering, but I did find that the average UC GPA was 4.08 and average SAT (old) was 1350 for enrolled Engineering students 2016-2017 along with a total of 1441 Engineering Undergrads (Freshman-Senior standing).
In comparison, SLO estimated 16781 Freshman applicants for Engineering with a projected enrollment of 1175 Freshman. Average CP GPA of 4.17 and SAT (new) of 1467. SLO does however have more Engineering major disciplines (13) vs UCSB (5).