Horsepower Lives Here
Pottstown’s Premier High-Performance Car Tuning Shop
Power
Upgrades
Boost your horsepower with precision-engineered upgrades:
- Superchargers/Blowers
Instant power, relentless performance. - Custom Turbo Design & Install
Tailored boost for your build. - Nitrous Systems & Refills
Quick hits of speed when you need it.
Drivetrain & Chassis
Upgrades
Dial in your ride for the street or track:
- Rear Gear Install
Optimize traction and acceleration. - Transmission Rebuilds
Smooth shifts, max durability. - Roll Cages
Safety and stiffness for hard launches. - Suspension
Corner hard, launch harder. - Brake Upgrades
Stop as fast as you go.
Engine & Exhaust
Performance
Unleash the roar and the power:
- Engine Rebuilds
From stock to savage, built to last. - Custom Stainless Exhaust
Signature sound, peak flow.
Dyno Tuning &
Testing
Measure it. Tune it. Dominate it:
- Dynojet Rental & Tuning
Precision power mapping for cars and bikes.
Welcome to the Peak of Performance
All Go!
Not Just Show!
At Miller Mountain High Performance, we don’t just tweak cars—we build beasts. From custom turbo installs to engine rebuilds, our expert team blends decades of old-school know-how with cutting-edge tech to deliver jaw-dropping power and precision. Young or old, we tune it right. Dyno-ready, built to flex—street or track, your ride’s next level.
Located on High Street in Pottstown, PA, we’re the go-to shop for car tuning, dyno testing, and mechanical upgrades. No paint, no fluff—just pure performance.
Ready to crank up the horsepower?
Call us at 610-326-7000 or book your slot today!
Book Your Dyno Appointment
Test Your Power. Tune Your Beast.
Call 610-326-7000 or fill out the form below to lock in your time!
Ready to see what your ride’s got? Schedule a dyno session at Miller Mountain High Performance and get precision tuning on our state-of-the-art Dynojet—cars and motorcycles welcome. From street builds to track monsters, we’ll dial in your horsepower and torque.
View Our Work
Custom Builds That Rip
Why Choose Miller Mountain?
- Dyno Tuning Experts:
Dyno on-site—test your power and dominate the scoreboard at Pottstown Nights Car Show. - Crazy Custom Builds:
Turbochargers, superchargers, nitrous setups, and custom stainless exhausts built to your specs. - Track-Ready Upgrades:
Roll cages, transmission rebuilds, suspension tuning, and rear gear installs for peak performance. - Proud Partnerships:
Marketing partner with Maple Grove Raceway and sponsor of Pottstown Nights Car Show—where horsepower reigns.
Google Reviews
What Our Customers Say
"I trust these guys"
“Fantastic performance shop!! Miller mountain went over and above to ensure my truck got tuned properly. I brought my truck in with a trash remote tune and they took the time to dial everything in to perfection. Super friendly service and very easy to deal with. I trust these guys with my vehicles and will be back for all my tuning needs in the future.”
- Justin D.
"Friendly and professional"
“First time customer here and these guys are the real deal. They installed a cat-back exhaust system on my 10th gen Si. Mr. Miller and his team were very friendly and professional. I am extremely happy with the work they've done. The shop is clean and the waiting area is cozy. I highly recommend this shop!”
- Drew
"Definitely have the knowledge"
“Had headers installed and engine and transmission tuned. Would like to thank Art and Logan for the excellent service and workmanship. These guys definitely have the knowledge and know how to get things done right and in a timely manner I would recommend this auto shop for repairs and high performance projects. I also think I made a new friend there his name is Rocky the dog. Thanks for everything guys.”
- Mike L.
Who We Are
Since taking the reins in 2021, Miller Mountain High Performance has fused decades of racing experience with next-gen technology. Our crew—veteran mechanics and tech-savvy tuners—lives for horsepower and thrives on turning your vision into reality. We’re not here to mess around; we’re here to do it right the first time.
Platinum Sponsor of Pottstown Nights Car Show
Miller Mountain High Performance proudly stands as a Platinum Sponsor of the iconic Pottstown Nights Car Show, lighting up High Street with raw power and adrenaline. As a cornerstone of this legendary car show, we bring the heat with our on-site dyno pulls—testing cars and bikes to their limits right in front of the crowd. Whether you’re chasing bragging rights or fine-tuning your build, our state-of-the-art Dynojet delivers the numbers that matter.
Every event, we roll out the Dyno Leader Board, showcasing the baddest rides in Pottstown. From boosted street machines to track-ready monsters, the dyno leaderboard is your shot at glory—and a chance to see how your setup stacks up. Dyno pulls are available during the car show, so bring your ride, strap in, and let’s see what you’ve got.
Spots go quick—call 610-326-7000 to reserve yours!
Join us at 323 East High Street, Pottstown, PA 19464, where we’re not just sponsors—we’re the heartbeat of performance at Pottstown Nights Car Show.
Marketing Partner with Maple Grove Raceway
Miller Mountain High Performance is proud to be a Marketing Partner with Maple Grove Raceway, one of the fastest and most iconic dragstrips in the country, located just down the road in Mohnton, PA. This partnership connects us to the heart of motorsport action, where we support the scene that fuels our passion—high-performance racing.
As a key player alongside Maple Grove, we bring our expertise in dyno tuning, custom builds, and mechanical upgrades to the table, helping drivers push their limits on the track. Whether it’s dialing in a record-breaking run or showcasing our work at events like the Pep Boys NHRA Nationals, we’re all about elevating the game.
Visit us at 323 East High Street, Pottstown, PA 19464, and let’s get your ride race-ready for the Grove. Call 610-326-7000 to start the conversation!