Quality Muffler, Catalytic Converter, Exhaust,

& Auto Repair.

We Treat Your Car Like Our Own!

Free Quotes & Affordable Prices

Call now

Quality Muffler, Catalytic Converter, Exhaust, & Auto Repair.

We Treat Your Car Like Our Own!

Free Quotes & Affordable Prices

Call now

The Trusted Muffler, Exhaust, & Repair Shop in Longmont.

Now Serving Boulder, Lafayette, Denver, Erie, Firestone, Fredrick, Fort Collins, Greeley, Lakewood, Loveland, Longmont, Thornton, and Windsor.


Get your car running its best at the auto repair shop that Longmont, CO, trusts. Romero's Muffler & Auto Repair is an auto and muffler shop that has been family-owned and operated since the beginning. Our mechanics are experienced and treat every car like their own.

The Trusted Muffler, Exhaust, & Auto Repair Shop in Longmont.

Now Serving Boulder, Lafayette, Denver, Erie, Firestone, Fredrick, Fort Collins, Greeley, Lakewood, Loveland, Longmont, Thornton, and Windsor.

Get your car running its best at the auto repair shop that Longmont, CO, trusts. Romero's Muffler & Auto Repair is an auto and muffler shop that has been family-owned and operated since the beginning. Our mechanics are experienced and treat every car like their own.

What We Offer

  • Emission Repairs
  • Muffler Repair
  • Catalytic Converter Replacement
  • Catalytic Converter Theft Prevention
  • Custom Exhaust
  • Exhaust Repair
  • Brake Service, Replacement, Repair & Tune-ups
  • Suspension - Shocks and Struts





  • Auto Tune-ups
  • Vehicle Diagnostics
  • Vehicle Inspections
  • Batteries
  • Alignment
  • Alternators
  • Radiators
  • Engine Repair



Why Romero's Muffler & Auto Repair? 

With our labor rates being the lowest in town, we're a great option for those looking for quality services at an affordable price. Here's why you should choose us:

Best Pricing in Northern Colorado

Offering Custom Work

Free Quotes

Skilled & Fully Trained Staff

Locally Owned

Family-Owned & Operated

Why Romero's Muffler & Auto Repair? 

With our labor rates being the lowest in town, we're a great option for those looking for quality services at an affordable price. Here's why you should choose us:

Best Pricing in Northern Colorado

Offering Custom Work

Free Quotes

Skilled & Fully Trained Staff

Locally Owned

Family-Owned & Operated

What We Offer

  • Muffler & Catalytic Converter Services
  • Custom Exhaust
  • General Auto Repairs

The state also certifies us to help when you fail your emissions test. If you've recently failed an emissions test and need your vehicle looked at, contact us today to see how we can help you.

Offering Impeccable Customer Service

Our repeat customers would tell you that they always trust us with their vehicles, and that's hard to find in the auto repair shop business. We believe in providing honest feedback and services to our customers, and in turn, they know that our auto repair shop practices equal and good business.

Here At Romero's

We are #1 Recommended Air Care Colorado certified auto repair facility for Boulder county! If you've recently failed an emissions test and need your vehicle looked at, contact us today to see how we can help you.

Offering Impeccable Customer Service

Our repeat customers would tell you that they always trust us with their vehicles, and that's hard to find in the auto repair shop business. We believe in providing honest feedback and services to our customers, and in turn, they know that our auto repair shop practices equal and good business.

★★★★★

Most affordable and my vehicle was fixed in 24 hours. I took my van in for issues with my alternator, being female and telling them the issue, I was treated with respect.



- Jocelin J.

★★★★★

Took my Ram 1500 in after the tail pipes fell off on the weekend. They were able to fit me right in and got the work done within an hour! Top notch work, top notch service! Highly recommend.


- Brandon C.

★★★★★

Lucas and the team are honest and reliable. I have brought multiple vehicles to them and will never go anywhere else. They just got done working on my truck and it’s running great! I highly recommend them!


- Spencer K.

★★★★★

I have been lucky enough to be working with Romero's muffler for a long time both for my personal cars and for business. They always do a remarkable job for a fair price. I cannot recommend them enough !


- Roger H.

★★★★★

I was recommended to Romeros from Jeremy's garage and if they trust them I immediately trusted them. They are so helpful and really try to do what's best for you and your car. They are honest and easy to talk to they are super accommodating and well :)


- Abernathy M.

★★★★★

They were friendly, and despite a massive snowstorm leaving them powerless and behind schedule, they still finished the full aluminized steel exhaust for my 53 on time. Good price and good work. I would recommend them to anyone.


- Evan P.

★★★★★

Most affordable and my vehicle was fixed in 24 hours. I took my van in for issues with my alternator, being female and telling them the issue, I was treated with respect.



- Jocelin J.

★★★★★

Took my Ram 1500 in after the tail pipes fell off on the weekend. They were able to fit me right in and got the work done within an hour! Top notch work, top notch service! Highly recommend.


- Brandon C.

★★★★★

Lucas and the team are honest and reliable. I have brought multiple vehicles to them and will never go anywhere else. They just got done working on my truck and it’s running great! I highly recommend them!


- Spencer K.

★★★★★

I have been lucky enough to be working with Romero's muffler for a long time both for my personal cars and for business. They always do a remarkable job for a fair price. I cannot recommend them enough !


- Roger H.

★★★★★

I was recommended to Romeros from Jeremy's garage and if they trust them I immediately trusted them. They are so helpful and really try to do what's best for you and your car. They are honest and easy to talk to they are super accommodating and well :)


- Abernathy M.

★★★★★

They were friendly, and despite a massive snowstorm leaving them powerless and behind schedule, they still finished the full aluminized steel exhaust for my 53 on time. Good price and good work. I would recommend them to anyone.


- Evan P.

Call (303) 651-2938 to learn more!

Call (303) 651-2938 to learn more!

Share by: