Greeley, CO Auto Repair Shop & Auto Mechanic for Car Repair, Radiator Repair & Muffler Repair
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.
"I went to Collins Muffler to get an exhaust system put on my truck. I dealt with Joe the manager and was very pleased. He was super helpful and made sure I got exactly what I needed for a fair price."
"Honest, reliable, and expert exhaust work! Collins Muffler has been fixing mufflers and pipes in Greeley for decades. Quick service and top-notch craftsmanship on every vehicle."
"Brought my vehicle in after getting absurd quotes at a dealership. Joe and his team at Collins inspect it on the lift, diagnosed the manifold leak, and repaired it same day. Highly recommended!"
"Top-tier custom bending and welding. They treated my classic car build with immense care and respect. Best custom muffler shop in Northern Colorado!"
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 pre-made mandrel pipe sections fitted 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.
Pre-made Mandrel Pipe Section 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.
Custom Dual Exhaust Fabrication
Full custom dual exhaust system fabricated from the header-back on a lifted 4×4 truck — heavy-duty piping, high-flow muffler, and chrome tips.
Classic El Camino Exhaust & Suspension
Full exhaust inspection and alignment on this restored El Camino — checking undercarriage clearance, hanger integrity, and tip positioning.
Lifted Truck Undercarriage Inspection
In-bay lift diagnostic for rust evaluation, flange condition, and custom exhaust routing on a lifted heavy-duty pickup.
Classic Coupe Full System Replacement
Complete undercarriage exhaust replacement on a restored classic — hand-fitted pipes with period-correct muffler and polished tips.
Vintage Pickup Custom Exhaust Build
Custom exhaust fabrication from the manifold back on a fully restored vintage truck — mandrel sections, hidden hangers, and dual chrome tips.
Classic Fleetline Exhaust Alignment
Precision exhaust alignment and tip fitting on a pristine red classic — ensuring proper heat clearance and showroom-quality finish.
Corvette Z06 Exhaust Inspection
Full undercarriage exhaust evaluation on a C6 Corvette — checking header clearance, muffler condition, and tip alignment for peak performance.
Classic Muscle Car Exhaust Service
Complete exhaust system inspection and alignment on a restored Chevelle — verifying hanger integrity, pipe routing, and period-correct sound profile.
Classic Coupe Engine & Undercarriage Work
In-shop engine bay and undercarriage service on a blue G-body classic — exhaust manifold inspection, pipe fitment, and custom tip selection.
Vintage Pickup Dual Tip Install
Polished stainless dual exhaust tips flush-mounted on a restored silver pickup — custom exit angle and show-quality weld finish.
Tri-Five Chevy Lift Inspection
Full lift diagnostic on a stunning black Tri-Five classic — evaluating exhaust system integrity, frame rust, and preparing for custom fabrication.
Classic V8 Engine Bay Service
Detailed engine bay work featuring polished aluminum intake, chrome dress-up, and custom blue silicone hoses — full undercarriage exhaust tie-in.
Studebaker Lark Exhaust & Inspection
Full exhaust evaluation on this rare coral-painted Studebaker compact — checking pipe routing, muffler condition, and preparing for custom tip fabrication.
Red Classic Coupe Lift Diagnostic
In-bay lift inspection for this pristine red classic — evaluating complete undercarriage condition, exhaust integrity, and planning custom system fabrication.
Collins Muffler & Service — Shop Front
Our full-service auto repair shop at 2601 W 10th Street — open Tuesday through Saturday for all your exhaust, brake, and automotive service needs.
Dual Tip Undercarriage Fabrication
Flush-mounted polished stainless dual exhaust tips welded and aligned on the lift — show-quality finish with precise bumper clearance.
Vintage Sedan Restoration & Inspection
Full shop evaluation on a rare pre-war vintage sedan — assessing frame condition, undercarriage integrity, and planning period-correct exhaust fabrication.
Jeep Wrangler Custom Exhaust Setup
Custom off-road exhaust system on a heavily modified Jeep — routing around suspension components, high-clearance design, and aggressive tip exit.
Classic Mopar Undercarriage Service
Complete undercarriage inspection and exhaust alignment on this pristine green Mopar classic — checking pipe fitment, hanger condition, and factory-correct tip positioning.
Custom Lowrider Exhaust Fabrication
Show-quality custom exhaust on a fully customized blue lowrider with candy paint and pinstriping — hidden hangers, flush tips, and mirror-polished finish.
Polished Chrome Dual Tip Install
Close-up of premium chrome dual-wall exhaust tips professionally installed — precision welds, perfect alignment, and show-car polish quality.
Catalytic Converter Undercarriage Service
Direct-fit catalytic converter replacement on a truck undercarriage — ensuring clean emissions compliance and leak-free operation after installation.
Winter Undercarriage Exhaust Inspection
Cold-weather lift inspection evaluating exhaust system integrity, rust from road salt exposure, and hanger condition on a full-size pickup.
Classic Red El Camino Full Service
Complete automotive service on this stunning red classic — including exhaust evaluation, brake inspection, and undercarriage assessment for show-ready condition.
Classic V8 Engine Bay & Exhaust Tie-In
Engine bay service on a pristine red classic featuring a detailed small-block V8 — with full undercarriage exhaust system tie-in and manifold inspection.
Custom Side Exit Exhaust Tip Mount
Flush-mounted polished stainless side exit tip professionally welded and aligned on a lifted white truck — clean body-side clearance and show-quality finish.
Classic Porsche 911 Engine & Exhaust Service
Rear-engine bay service on a classic air-cooled 911 — inspecting heat exchangers, exhaust header condition, and planning custom muffler upgrade for that signature flat-six sound.
Dedicated Automotive Exhaust & Service Specialties
From pre-made mandrel exhaust pipe sections to brake rotor turning and A/C service, our Greeley bay handles it all with quality craftsmanship 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
- Diagnostic check engine code scanning
- Full exhaust flow restoration
- Colorado emission compliant
Custom Exhaust & Performance
Flowmaster, MagnaFlow, Pre-Made Mandrel Bends & Dual Pipes
Custom exhaust fabrication for muscle cars, classic hot rods, lifted trucks, and daily drivers. We order pre-made mandrel-bent pipe sections, weld them into custom quad stainless tip setups, and deliver high-performance sound.
- Flowmaster, MagnaFlow, Borla mufflers
- Pre-made 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
General Auto Maintenance & Tune-Ups
Oil Changes, Belts, Hoses, Batteries & Routine Vehicle Care
Keep your car, truck, or SUV running reliably with routine automotive maintenance. From conventional and synthetic oil changes to tune-ups, belts, hoses, batteries, and fluid services—our Greeley mechanics handle the everyday upkeep that prevents costly breakdowns.
- Conventional & synthetic oil changes
- Spark plug, ignition & tune-up service
- Serpentine belts, hoses & coolant service
- Battery testing, charging & replacement
Custom Exhaust Fabrication & Welding
Have a custom build, classic hot rod, or lifted truck requiring precision exhaust piping? Collins Muffler sources pre-made mandrel-bent pipe sections and hand-welds them into exhaust systems engineered for tone, clearance, and performance.
Pre-Made Mandrel Bends & Hydraulic Bending
We source smooth, non-restrictive 2.25", 2.5", 3", and 3.5" pre-made mandrel-bent pipe sections 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.
Pre-Made Mandrel Bends & Exhaust Welding Solutions
Unlike quick-lube shops that rely on restrictive off-the-shelf crush-bent pipes, Collins Muffler orders pre-made mandrel-bent pipe sections and uses 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.
Protect Your Vehicle From Catalytic Converter Theft
Catalytic converter thefts occur in under 2 minutes. Protect your exhaust system with laser-cut heavy aluminum security plates installed directly on our Greeley lift bay.
10-Gauge Heavy Armor Plate
Laser-cut high-grade aluminum and stainless steel plates engineered to deflect reciprocating saw blades and bolt cutters.
Tamper-Proof Security Hardware
Installed with specialty anti-theft security fasteners that cannot be removed with standard socket sets or wrenches.
OEM Fitment & Heat Ventilation
Custom louvers and heat ventilation ports preserve exhaust airflow, thermal dissipation, and factory ground clearance.
High-Risk Vehicle Protection
Direct-fit plates stocked for Toyota Prius, Tacoma, Tundra, Ford F-150, Honda Accord, Element, and commercial fleet vans.
Schedule a Free Undercarriage & Fitment Lift Inspection
Every vehicle subframe and exhaust layout varies. Bring your truck, SUV, hybrid, or sedan to Collins Muffler for a quick lift inspection. We'll verify subframe clearance, inspect factory hangers, and confirm exact shield compatibility for your make and model.
- Free undercarriage lift scan
- Subframe fitment verification
- Stocked for Prius, Tacoma, F-150 & more
- Fast, professional shop installation
Ready to Protect Your Exhaust?
Inquire About Security Shield Fitting
Fill out our contact form below or call direct to request your inspection time.
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