Catalytic converter service
Diagnosis, testing, and replacement when warranted. We do not replace cats that are not actually failed.
Exhaust
Vehicle Exhaust System Services in Boulder, CO
From a leaking gasket to a full exhaust system, we keep your vehicle quiet, efficient, and emissions-compliant.
Full exhaust system service from headers to tip. Catalytic converter diagnosis and replacement, muffler and pipe work, oxygen sensor service, exhaust manifold and gasket repair, and emission inspection prep. Quality parts, honest diagnosis, no upselling on expensive cats that do not need replacing.
Exhaust service, end to end.
Exhaust problems range from a $50 hanger to a $2,000 catalytic converter. Diagnosis matters here as much as anywhere.
Muffler replacement
OEM-style or performance options. Quiet, durable, and properly fitted.
Exhaust pipe and clamp service
Pipe sections, clamps, and connections replaced with quality parts and proper alignment.
Oxygen sensor diagnosis and replacement
Upstream and downstream O2 sensors tested with live data before replacement.
Exhaust manifold and gasket service
Cracked manifolds, blown gaskets, and broken bolts addressed with proper repair, not band-aids.
Flex pipe repair
Flex sections that connect engine and exhaust replaced when failed. Common cause of new rattles.
Hanger and bracket replacement
Often the source of the rattle is a $20 part. We check the easy stuff first.
How to tell exhaust needs attention.
If you notice any of the following, do not wait. Small issues become expensive ones quickly.
- Loud or droning exhaust note that was not there before
- Rattle from underneath, especially at idle or over bumps
- Sulfur or rotten egg smell from the tailpipe
- Check engine light with oxygen sensor or catalyst codes
- Failed emissions inspection
- Noticeable drop in fuel economy
- Vibration at idle that smooths out at speed
How we run exhaust diagnosis.
Inspect from headers to tip
Visual and hands-on inspection of every section, hanger, joint, and sensor.
Isolate the leak or fault
Smoke testing, listening, and live data to pinpoint the actual source before parts get involved.
Diagnose oxygen sensor and catalyst function
Live data on upstream and downstream sensors confirms whether the catalyst is doing its job.
Repair with quality components
OEM, OE-equivalent, or quality aftermarket. We tell you the trade-offs and let you choose.
Verify and clear codes
Codes cleared, drive cycle completed, and post-repair scan to confirm no return.
Why exhaust work belongs here.
We diagnose catalysts before we replace them
A catalytic converter is one of the most expensive parts on the car. We confirm it is actually failed, not just throwing a code from another cause.
OEM and quality aftermarket options
We give you real choices on cats and mufflers, with honest pros and cons on each.
Emission inspection prep
Boulder County emissions testing has specific requirements. We make sure your vehicle is ready before you go.
Photo documentation
You see the cracked manifold, the rusted-through pipe, the failed sensor. The reason for the work is visible.
Warranty backed
Three-year, thirty-six-thousand-mile NAPA warranty on qualifying exhaust repairs.
Mile-high roads ask more of every vehicle.
Boulder vehicles work harder. Thinner air, hard freezes, dust, sun, and steep grades all wear parts faster than the manufacturer schedules assume. We tune our service intervals to how your vehicle actually lives at altitude.
Altitude
Lean-running engines, harder-working turbos, and drivetrains that climb every commute.
Freeze cycles
Repeated thaw and refreeze chews through seals, hoses, batteries, and brake hardware.
UV and dust
High-altitude sun and grit accelerate paint, plastics, glass, and intake fouling.
Frequently Asked Questions
If your check engine light is on for an emissions-related code, yes, you will fail Colorado emissions testing. We diagnose the underlying cause, repair it correctly, and get the readiness monitors set so you pass on the first try.
You may also need
Boulder talks. We listen.
“These guys are honest, transparent, and clearly know what they are doing. They walked me through everything with photos before doing the work.”
Sarah K.
2019 Subaru Outback
“Best shop in Boulder. Free loaner, fair pricing, and they actually care about doing the job right. Will not take my truck anywhere else.”
Marcus T.
2017 Toyota 4Runner
“I am picky about who touches my EV. Legacy was the only shop locally that I trusted with the work, and they delivered.”
Priya N.
2022 Tesla Model Y
“These guys are honest, transparent, and clearly know what they are doing. They walked me through everything with photos before doing the work.”
Sarah K.
2019 Subaru Outback
“Best shop in Boulder. Free loaner, fair pricing, and they actually care about doing the job right. Will not take my truck anywhere else.”
Marcus T.
2017 Toyota 4Runner
“I am picky about who touches my EV. Legacy was the only shop locally that I trusted with the work, and they delivered.”
Priya N.
2022 Tesla Model Y
Ready to Book?
Schedule your vehicle exhaust system services today.
Free loaner vehicles for qualifying repairs. Photo and video documentation on every job. Three-year, 36,000-mile NAPA warranty.