D&M Auto Repair & Mufflers in Chula Vista's Otay corridor — listed on Google as Mufflers & Auto Repair Garage — occupies Suite C at 2530 Main Street, specializing in custom exhaust fabrication, catalytic converter replacement, and general mechanical service. The shop sources used exhaust components and hard-to-find OEM muffler assemblies through salvage networks that include Import Auto Wrecking, keeping repair costs manageable on older import platforms where new-manufacture parts are discontinued. Services extend well beyond the exhaust bay to include shock and strut replacement, brake repair, engine diagnostics, and full engine replacement when repair is no longer viable. Completed exhaust and engine jobs leave the Main Street complex looking their best after a rinse at corridor-adjacent wash facilities such as Super Star Car Wash on Palomar and Third Avenue. The facility's highest-demand exhaust service involves CARB-compliant catalytic converter installation paired with custom-bent stainless-steel mandrel piping, maintaining factory-spec backpressure while meeting California's Title 13 emissions requirements for converter efficiency above 95%.