Lou's Custom Exhaust

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About Lou's Custom Exhaust
Lou's Custom Exhaust operates as a muffler shop in Derry, New Hampshire, holding a 4.7-star rating derived from 127 customer reviews. The business welcomes vehicle owners seeking exhaust system diagnostics, repair, and replacement services. Serving residents throughout Derry and surrounding communities in the greater Hillsborough County area, the shop maintains standard weekday hours from 8 AM to 5 PM with Saturday availability until 1 PM and Sunday designated as closed.
The shop distinguishes itself through flexible scheduling accommodations and warranty options tailored to individual customer needs. Reviewers consistently highlight reasonable pricing structures alongside willingness to tackle complex repair scenarios that other shops might decline. The team provides both standard and extended warranty coverage, with some customers securing five-year protections on completed work. Service tickets encompass routine muffler repairs alongside custom dual exhaust installations for classic vehicle restorations.
Customer narratives reveal a shop committed to transparent communication throughout service procedures. One reviewer described Jason sending progress photographs during a dual exhaust installation on a 1977 Oldsmobile Cutlass Supreme, checking satisfaction at each stage. Another account detailed same-day appointment availability when an urgent muffler issue arose, with the technician remaining past standard closing hours to complete the work. These examples illustrate the shop's approach to balancing efficient turnaround with thorough craftsmanship.
What Customers Say
127 reviews yield a 4.7-star average with 5 named customers awarding full marks. Positive reviewers cite Jason by name alongside reasonable pricing and flexible warranty options. One negative review references delays and post-repair leak discovery, representing the sole 1-star account.
Working Hours
| Sunday | Closed |
| MondayToday | 8 AM–5 PM |
| Tuesday | 8 AM–5 PM |
| Wednesday | 8 AM–5 PM |
| Thursday | 8 AM–5 PM |
| Friday | 8 AM–5 PM |
| Saturday | 8 AM–1 PM |
Services
Muffler Repair & Replacement
Standard muffler repair for hanging, rattling, or damaged exhaust components on daily drivers and trucks.
Exhaust System Diagnostics
Professional diagnosis of exhaust noises, smells, and check engine light triggers related to emission systems.
Custom Dual Exhaust Installation
Custom dual exhaust setups for classic car restorations and performance-oriented vehicle modifications.
Sensor & Bung Replacement
O2 sensor replacement and bung repairs for exhaust monitoring and emission compliance.
Exhaust Leak Repair
Identification and repair of exhaust leaks including manifold gaskets, piping connections, and catalytic converter issues.
Warranty Options
Extended warranty coverage available ranging from one-year to five-year terms depending on repair scope.