Exhaust Service
Quiet it down. Clear inspection.
Failed mufflers, broken hangers, leaks at the flex pipe, oxygen sensors, and catalytic converters — the exhaust problems New Hampshire roads create and state inspection catches. We do the repair, not the upsell.
first, replace only if needed
Repair
A bad hanger or small leak doesn't require a full system — we fix what's failing.
inspection-aware
NH
We understand the exhaust faults that fail New Hampshire state inspection and how to address them.
or quality aftermarket
OEM
Cats, O2 sensors, mufflers — sourced for fit and longevity, not the cheapest part on the shelf.
Anatomy of a leak
Where exhaust problems actually live.
Most exhaust complaints trace to one of a handful of spots. Hover or focus a label to see what we repair on each component.
Exhaust system · diagrammatic
Component
Catalytic converter
Internal failure or rattle. Often caused by an upstream issue we diagnose first.
Click another number above to compare components.
What you'll notice
Sounds, smells, sensors.
Exhaust problems show up in three ways. We work back from the symptom to the failure.
Sounds
Rumble that wasn't there yesterday, ticking at startup, hissing at the firewall, banging over bumps. Each points to a different failure spot.
- Sudden rumble
- Ticking at startup
- Hiss near firewall
- Banging on bumps
- Rattle on idle
Smells
Rotten egg from the tailpipe means the catalytic converter is struggling. Exhaust in the cabin means a leak ahead of the cat — that's urgent.
- Rotten egg from tailpipe
- Exhaust in the cabin
- Sulfur smell after acceleration
- Burnt fuel odor
Sensors
P0420 family (cat efficiency), P0171 / P0174 (lean — often an exhaust leak), oxygen-sensor codes. We diagnose before we replace.
- P0420 / P0430 (cat)
- P0171 / P0174 (lean)
- P0130–P0167 (O2 sensors)
- P0440-series (EVAP, related)
What we repair
Repair work, scoped honestly.
We focus on exhaust repair — not custom or performance work. If a hanger fixes it, that's what gets quoted.
Muffler replacement
Direct-fit replacement when the existing muffler is internally corroded or weld-failed.
Hanger replacement
Rubber hangers, brackets, and the welds that hold them. The cheapest exhaust fix.
Flex pipe + gaskets
Section replacement at the failing joint. Manifold and downstream gaskets too.
Oxygen sensors
Diagnosed before replaced. Upstream vs downstream, the right part for the failure.
Catalytic converters
When testing confirms the cat is the failure — we don't replace cats on a guess.
Mid-pipe + tailpipe
Rust-through repair or section replacement. Keep the system tight and quiet.
NH state inspection
Exhaust faults that fail inspection — and what to do.
Excessive noise, visible leaks, a cat that's been removed or gutted, and certain emission-related codes will all fail New Hampshire state inspection. We diagnose and repair the failure so the vehicle passes on re-test. Note: confirm with our office whether we issue inspection stickers on-site or coordinate with a partner inspection station.
From the bay — customers we got back through inspection
Bobby LeBrun
a year ago · Hyundai · Sensor replacement
Took my Hyundai VT here to get some sensors replaced and they were so easy to work with. Quick, price was fair, overall very professional
FAQ
Exhaust FAQ
Common questions about exhaust repair in Manchester.
01
My car is loud. Do I need a whole new exhaust?
Almost never. The most common cause of sudden exhaust noise is a broken hanger or a leak at a flex pipe, gasket, or muffler weld — all repairable without replacing the entire system. We diagnose where the failure is and fix that.
02
My check engine light is on with a catalytic converter or O2 sensor code. Do I need a new cat?
A cat code (P0420 family) sometimes means the cat is failing, but often the actual cause is an upstream issue — a failed O2 sensor, an exhaust leak before the cat, or a misfire damaging the cat. We test the upstream conditions before recommending the expensive part.
03
Do you do performance or custom exhaust work?
No. Pro Tech focuses on exhaust repair — mufflers, hangers, leaks, sensors, and catalytic converters. If you want a custom cat-back or performance system fabricated, you'll want a dedicated performance shop.
04
Will fixing the exhaust pass NH state inspection?
If the issue is exhaust-related (a leak, a failed cat, an O2 code, or noise above the legal limit) and the repair restores the system to compliant condition, yes. We don't issue inspection stickers ourselves unless we're a licensed inspection station — confirm with our office when you book.
05
I smell exhaust inside the cabin. Is that urgent?
Yes. Exhaust in the cabin means a leak in the system is feeding fumes into where you breathe — that's a carbon monoxide risk. Don't drive it any further than necessary; call us and bring it in.
06
How long does a typical exhaust repair take?
Hanger or gasket repair is often same-day. Muffler replacement same-day in most cases. Catalytic converter or sensor work depends on parts availability — typically one to two days once the part is in hand.
More services
The rest of the menu.
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From brake jobs to engine internals — the full mechanical menu, including Audi and other European service.
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Maintenance
Scheduled service that protects the engine and surfaces wear before it becomes a breakdown.
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Diagnosis
Decoded, not guessed. We test before we recommend so the repair actually fixes the problem.
Explore DiagnosisCoding, modules, component protection
Programming
Replacement control modules sourced, installed, and coded to your VIN — including Audi/VW component protection — without the dealer visit.
Explore Programming
Book Service
Schedule the repair.
Send a few details and we'll confirm a time — usually within one business day.
- Phone
- (603) 270-5456
- Address
- 61 Elm St, Unit 5
Manchester, NH 03101 - Hours
- Mon–Fri 8:00 AM – 5:00 PM
Prefer to call? Dial (603) 270-5456 during shop hours.