Recommendation for good exhaust shop in south Orange County CA?

Need to get a reputable exhaust shop that can work on 1995 Mustang GT with modified exhaust. I am having trouble passing smog due to visual inspection and have been told I'm missing CATs, but yet I have no issue with the sniff test, so questioning why I'm not passing visual... Would appreciate any input of a place in Mission Viejo, Aliso Viejo or surrounding area. Thank you!!
 
  • Sponsors (?)