First off that does not sound like a brake booster to me. 2nd there are a few shops in oc but not any that are mustang specific. I know that there is a shop at costal highway and 50 at the shell station (he is the guy who sells the cam 2 and vp c16 during cruise week), and a shop on 9th or 10th street on costal and another one on 72 street (sorry i dont have there numbers though.) What day are you coming down?
90 GT, Just the average, R blocked 331,X-trim, AFR 205's, solid roller, spyder intake.....Street Car
95 COBRA, (Keeps the wife happy) with a 331, B41hr, Victor Jr. heads, systemax intake, and 10 lbs. from a S-trim.
(and a bunch of other stuff thats not a mustang)