My favorite is a Smog shop (Just Smog near Mission Gorge and I-8) located just round the corner from Performance Independant Porsche in Mission valley.
My 911 passed on the 4th test today, whew...
The smog shop is not so remarkable but its proximity to Performance Independant Porsche is a BIG PLUS.
After each fail 5 minutes later I was back without an appointment at Performace Independant Porsche, even so the owner Mark was right on it.
Short story is after adjusting the a/f he replaced an O2 sensor and it passed with very clean numbers.
86 911 120k miles.
Mark is a fantastic mech and charged me nothing for the labor and interuptions.
I didnt even have an appiointment but he worked on the car or gave me the tools and supervision to do it at his shop.
I can't imagine any car shop or shop of any kind being as helpful as Mark at Performance Independant Porsche in Mission Valley.
I've been going to Mark for 10 years but had not seen him since my last smog 2 years ago when he helped me tune it to pass last time.
What service just OUTSTANDING!
Again never charged me a cent for labor and treated me like I was his favorite customer!
To show my gratitide to Mark I treated him and his 3 employees at the Performance Independant Porsche to a BBQ lunch from the place next door.
I got off cheap and the BBQ was pretty good too!

Performance Independant Porsche (619) 563-5927 open Monday thru Thursday.