Your vehicle wasn't built to
play it safe.
From precision diagnostics to full performance builds — we treat every car like it's ours. No shortcuts. No upselling. Just honest, expert work that keeps you moving.
Built for every
stage of performance
Engine Diagnostics & Repair
Advanced OBD scanning, compression testing, and precision engine work. We find the problem — not guess at it.
Performance Tuning
ECU remaps, intake upgrades, and exhaust systems. Unlock your car's true potential with calibrated, safe gains.
Brakes & Suspension
Stop with confidence. Premium brake pads, rotors, and coilover installs tuned for street or track.
Oil & Preventive Maintenance
Synthetic blends, full synthetics, and factory-specified fluids. Keep your engine running clean and protected.
Transmission Service
Fluid flushes, filter replacements, and rebuilds. Smooth shifts start with proper transmission care.
A/C & Heating
Refrigerant recharge, compressor repair, and climate control diagnostics. Stay comfortable in every season.
Not just a garage.
A standard.
Sweeney's Performance was born from a simple belief: your car deserves more than a quick fix and a guess. Located in the heart of Thurmont, we've spent over two decades perfecting the craft of automotive care — from daily drivers to weekend projects.
We don't cut corners. We don't upsell services you don't need. And we don't consider a job done until it's done right. That's why drivers from Frederick to Myersville trust us with their vehicles.
Why Thurmont
chooses us
We Listen First
Every repair starts with understanding your car, your driving, and your budget. No assumptions. No pressure.
Precision Tools
Modern cars demand modern diagnostics. We invest in the latest scan tools and equipment so we get it right the first time.
Quality Parts
We use OEM or premium aftermarket parts. Because cheap fixes become expensive problems — and that's not our style.
Done Right
We stand behind every job. If something isn't right, we make it right — period. That's the Sweeney's promise.
Your car is capable of
more than you know.
Whether it's routine maintenance or a full performance build, Sweeney's Performance delivers results you can feel.
Let's talk
about your car.
Have a question or need to schedule a service? Reach out — we're here to help.
Thurmont, MD 21788-2714
Sat: 9:00 AM – 2:00 PM
Sun: Closed
