Since 1967,
We Are Here To Help!
Specializing in custom performance exhaust systems, brake repair, A/C service, coolant flushes, suspension, and oil changes in Greeley, CO.
From original factory exhaust replacements to high-flow dual performance headers and custom welds — we get your vehicle sounding and running right.
Google Reviews & Shop Location
Serving Greeley and Weld County since 1967. Rated highly for custom exhaust fabrication, brake service, and honest advice.
"Best muffler shop in Northern Colorado hands down! Had them bend custom dual exhaust for my '72 Chevy truck. The welds look like art and the exhaust note is absolute perfection. Fair pricing and fast turnaround."
"Took my Ford F-250 in after getting crazy high quotes elsewhere for a rusted exhaust manifold and muffler. Collins fixed it up same day for hundreds less. Honest, hard working local mechanics."
"Brought my SUV in for A/C repair and a coolant flush before our road trip to the mountains. Cold air blowing strong and engine runs smooth. Excellent customer service!"
"Been coming to Collins Muffler for over 15 years for brake jobs and custom exhaust work. You cannot beat 50+ years of family business integrity."
Our Featured Exhaust & Service Projects
Real photos from our shop bays at 2601 W 10th St showing precision welds, custom pipe fabrication, and heavy-duty exhaust installs.
Precision MIG/TIG Exhaust Weld
Clean hand welds and mandrel pipe bends crafted directly in our Greeley shop bay.
Full Undercarriage Exhaust System
Full system replacement with custom high-flow mufflers and heavy-duty hanger brackets.
Performance Muffler & Tip Fitting
Custom stainless performance mufflers fitted for maximum exhaust flow and optimal sound profile.
Catalytic Converter & Pipe Replacement
Direct-fit catalytic converter and exhaust pipe replacement ensuring clean emissions and leak-free operation.
Custom Pipe Bending & Hanger Welding
Hand-bent exhaust piping custom contoured and securely mounted with heavy-duty steel hangers.
Truck Undercarriage Lift & Diagnostic
In-bay lift inspection for exhaust rust leaks, broken flanges, and worn-out hangers.
Custom Mandrel Pipe Bend Installation
Custom quad exhaust tip setup and precise undercarriage piping fitted for a Pontiac GTO.
Undercarriage Exhaust Alignment
Professional undercarriage alignment ensuring heat clearance, zero rattle, and leak-free joints.
Dual Exhaust Tip Fabrication & Polish
Custom welded exhaust tips aligned flush with bumper and polished for a clean finish.
Dedicated Automotive Exhaust & Service Specialties
From precision mandrel exhaust bends to brake rotor turning and A/C service, our Greeley bay handles it all with transparent pricing and master welding.
Muffler & Exhaust Repair
Rust Fixes, Hangers, Leaks & Quiet Replacements
Fix deafening exhaust roars, rusted-out pipes, dangling hangers, and manifold leaks. Quality aluminized and stainless steel mufflers welded with lifetime joint guarantees.
- Custom pipe bending & rust cutout
- Quiet OEM replacement mufflers
- High-flow performance mufflers
- Heavy duty hanger re-welding
Catalytic Converter Replacement
State Emission Compliance & Check Engine P0420 Fixes
Direct-fit catalytic converters for all vehicle makes and models. Fix check engine lights (P0420/P0421), replace stolen converters, and ensure Colorado emission compliance.
- Direct-fit & universal converter options
- Anti-theft protective shield installation
- Diagnostic check engine code scanning
- Full exhaust flow restoration
Custom Exhaust & Performance
Flowmaster, MagnaFlow, Mandrel Bends & Dual Pipes
Custom exhaust fabrication for muscle cars, classic hot rods, lifted trucks, and daily drivers. Custom mandrel bending, quad stainless tips, and high-performance sound setups.
- Flowmaster, MagnaFlow, Borla mufflers
- Mandrel-bent stainless dual piping
- Custom headers & cat-back systems
- Polished chrome & matte black tips
Brakes, Suspension & Welding
Ceramic Pads, Turned Rotors, Shocks & Hitch Fabrication
Complete brake pad replacement, brake rotor resurfacing, gas-charged struts, shocks, trailer hitch installation, and custom structural steel welding.
- Ceramic & heavy-duty metallic brake pads
- On-site brake rotor turning & resurfacing
- Monotube struts & towing suspension
- Trailer hitch & receiver fabrication
A/C Service & Coolant Flushes
Keep Your Engine Cool & Cabin Icy Cold in Colorado Summers
Automotive A/C refrigerant vacuum leak test and recharge alongside high-pressure radiator coolant system flushes to protect engines from overheating.
- R134a & R1234yf refrigerant recharge
- Compressor & expansion valve checks
- Radiator back-flush & thermostat service
- Anti-corrosion long-life coolant refill
Custom Exhaust Fabrication & Welding
Have a custom build, classic hot rod, or lifted truck requiring precision exhaust piping? Collins Muffler builds handcrafted, mandrel-bent exhaust systems engineered for tone, clearance, and performance.
Precision Mandrel & Hydraulic Bending
Smooth, non-restrictive 2.25", 2.5", 3", and 3.5" pipe bends for maximum exhaust velocity and horsepower output.
MIG & TIG Custom Exhaust Welding
Leak-proof structural welds on aluminized steel and T304 stainless steel tubing built to endure harsh Colorado road salt.
Custom X-Pipes, H-Pipes & Resonators
Crossover pipe engineering to eliminate low-RPM exhaust drone, optimize exhaust scavenging, and dial in tone.
Hot Rods, Muscle Cars & Lifted Trucks
Bespoke exhaust routing around high-clearance suspension lifts, aftermarket crossmembers, and classic chassis.
Bespoke Pipe Bending & Exhaust Welding Solutions
Unlike quick-lube shops that rely on restrictive off-the-shelf crush-bent pipes, Collins Muffler uses heavy-duty hydraulic benders and precision welding to craft custom-fit exhaust setups directly in our Greeley bay.
Ready for Custom Pipe Work?
Free On-Bay Consultation
Bring your vehicle by 2601 W 10th St or send us build specs.
Catalytic Converter Anti-Theft Shield Installation
In Northern Colorado, thieves can saw off an exposed catalytic converter in under 90 seconds, leaving you with $1,000–$4,000+ in unexpected repairs. Our custom-fit heavy aluminum security shields lock down your undercarriage to prevent costly theft.
Custom Aluminum Plate & Security Bolts
Heavy 10-gauge laser-cut aluminum shield covering twin converter units under a truck chassis.
Full Length Armor for Trucks & SUVs
Heavy-gauge stainless steel lock guard plate mounted with tamper-proof shear hardware.
Why Are Toyota Prius, Tacoma, Accord & F-150 Targeted?
Hybrids and late-model trucks contain higher concentrations of precious metals (Platinum, Palladium, Rhodium). A $280–$390 anti-theft shield prevents a $1,500–$3,500 replacement nightmare.
Shield Installation Packages & Upfront Pricing
Includes full shield assembly, security hardware, and lift rack labor at 2601 W 10th St, Greeley
Compact & Sedan Security Shield
Toyota Prius, Honda Accord, Civic, Corolla, Subaru Outback
- 10-Gauge CNC Laser-Cut Aluminum Plate
- Stainless Steel Tamper-Proof Security Hardware
- Heat-Dissipating Air Flow Vents
- No-Drill Factory Frame Mounting (on most models)
- Includes Lift Rack Installation & Inspection
Truck & Full-Size SUV Heavy Armor Shield
Ford F-150, Toyota Tacoma, Tundra, Chevy Silverado, Ram 1500, SUV
- Heavy Duty 3/16" 5052 Aircraft-Grade Aluminum Armor
- Full Dual-Converter & O2 Sensor Protection
- Shear Security Bolts (Cannot be unscrewed with regular sockets)
- Rust & Road-Salt Resistant Anodized Finish
- Complete Undercarriage Weld & Fitment Check
Custom Welded Steel Security Cage / Fabrication
Commercial Vans, Fleets, Lifted Trucks & Non-Standard Chassis
- Thick-Wall Steel Tube Reinforcement Cage
- Direct Frame Weld Points for Maximum Theft Deterrence
- High-Heat Rust Inhibitor Coating
- Custom Fitment Built In-Shop in Greeley
- Ideal for Fleet Vehicles & High-Risk Parked Vans
Truck & Muscle Car Fitment & Exhaust Sizing Spec
Select your vehicle model to view stock vs upgraded custom exhaust pipe diameters, muffler options, and sound profiles for Greeley, Evans & Weld County drivers.
Ford F-150 — 5.0L V8 Coyote
Mandrel mandrel-bent tailpipes clear spare tire and rear axle perfectly.
Factory tubing often features pinch bends and restrictive catalytic/muffler chambers that muffle exhaust flow and quieten the engine.
Mandrel smooth-bend mandrel tubing maximizes velocity, relieves exhaust backpressure, and unleashes clean exhaust horsepower.
- Flowmaster Super 44 (Deep Classic V8 Growl)
- MagnaFlow Street Series (Smooth Performance)
- Borla ProXS (Aggressive Crisp Tone)
Deep rumble at idle with an aggressive high-RPM roar. Zero drone option available.
Interactive Price Calculator
Get an accurate estimate for parts & labor, estimated shop hours, and expected turnaround time at Collins Muffler & Service in Greeley, CO.
Estimate Your Service
Direct-fit OEM quiet or high-flow performance mufflers (Flowmaster/MagnaFlow) with solid welded hangers.
* Final pricing provided upon visual lift inspection at shop (2601 W 10th St, Greeley).
Authorized Installer of World-Class Exhaust & Performance Brands
Free Lift Inspection & Exhaust Noise Diagnostic
Hear a rattle, loud roar, or check engine light? Drive up to 2601 W 10th St in Greeley. We put your vehicle up on the hoist for a free visual undercarriage check—no obligation, no hidden fees.
Frequently Asked Exhaust & Service Questions
Get clear, honest answers from our 57-year local shop technicians before visiting 2601 W 10th St.
Weld County & Northern Colorado Service Area
Drivers choose Collins Muffler & Service because we provide master custom exhaust welds and honest repairs that surrounding dealerships and national chains can't match.
Contact Collins Muffler & Service
Have questions about exhaust customization, catalytic converter replacements, or brake repair? Drop us a line or visit our shop bay on 10th Street.
Shop Address
2601 W 10th Street
Greeley, CO 80634
Hours of Operation
Tuesday – Saturday: 9:30 AM – 5:00 PM
Sunday & Monday: Closed