Miller Mountain High Performance (Performance Specialties)

Reviews

Reviews are sorted by relevance, with the most helpful and insightful feedback listed first for easy reference.

  Alex White
5 months ago
Nice guys and do clean work. A great local tuner shop that can do a whole lot. Got a stainless steel custom exhaust here and she's minty. Clean welds, straight lines, perfect fitment.

  Jason Shenk
a year ago
Liars and bad mechanics all around. I cannot put everything here because it is too long but they damaged my car in multiple ways, had it for 114 days, did terrible quality work and charge way more than they should. They know zero about working on cars and claim my parts were wrong which they were not, they are simply incompetent. They didn't even install the correct spark plugs needed with the Procharger, didn't know where my schrader valve was (wanted me to buy new rails lol) and returned it with a super lean air fuel ratio. What a joke. Pics show the damage they caused and they couldn't even put my bumper on correctly. This is how it was returned to me! They were tuning it but didn't even have the ecu connected right.Yea, I lost money to these people but I am most upset with the damage that was caused to my car that they deny. I wish I could give more details but not enough room. If you have a nice car, please don't go here. All reviews that are positive are their buddies, guaranteed. This place should be out of business. They will respond and do the only thing they are good at, lying. Believe the bad reviews.

  Ashley Rusden
a month ago
Nice guys- took my camaro there for a quick tune to turn off the DOD. Didn't take long and enjoyed the car chat afterwards! These guys can make ya go fast or perform some daily driver maintenance, I appreciate a shop that can cater to everyone, not just the super fast guys!

  Scott Dixon
a year ago
Very helpful shop, they did a great job installing custom exhaust on my E 550 Mercedes. They also gel coated my calibers red and installed new cross drilled rotors and ceramic break pads. I would recommend them to any one that wants professional coustom work done

  John Rodrigues
4 months ago
Liars and Terrible Mechanics ! Stay Away From This Shop At Alll Costs ! They have no idea what they are doing , timelines for any kind of work are outrageous compared to any other shop ! Price Changes From Original Estimate to the Day Work is Actually Completed by THOUSANDS OF DOLLARS ! Welds and Pipe Work Are Severly Mediocre/Low Quality . Please BE AWARE and STAY AWAY ! FreedomMotorsportz in EXTON is 100x better .

  Tyler Shepherd
6 months ago
let me start by saying these guys are great! i brought my truck to them after getting screwed by another shop and these guys got on it. with parts issues, and some incorrect installs of parts (on my end) these guys did all they can to help me get this truck finished. theyre communication and professionalism is top notch. now my truck is not done yet cause of a failed turbo charger (on3s fault) and front main seal (definatly my fault on the seal) i ll will be correcting it and bringing it back as long as i haven t annoyed them enough lmfao. Art and Logan are 2 great guys that have awesome skill sets and don t treat you any different because you may not be as knowledgeable when it comes to high performance, but yet they give advise and help further understand everything going on. give them a shot!

  Ibrahim
7 months ago
My experience was very good with Miller Mountain. I went there for some exhaust modifications for my pickup. Art is a very nice guy and all his crew. They also do state inspection and oil change and more auto work. You won't regret it if you go there.

  Jovan Drabick
a year ago
Super friendly and knowledgeable staff. I had them replace my throw out bearing and rear main seal on my Camaro. All went very smoothly. Very quick turn around time, and they spent all the time necessary to answer any of my questions. Even ones unrelated to the work being done. I would definitely recommend giving Miller Mountain a chance if you are looking to have work done on a car you wouldn t trust any regular mechanic to do.

  Audrey Landis
a year ago
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 LandisServices: Exhaust, Auto engine tuning

  Cody Rose
a year ago
I couldn't of had a better experience with these guys. Art and Logan along with everyone else i met were very knowledgeable, professional and passionate about building cars.Im not the easiest person to deal with and kept changing my mind and asked a million questions. They were very patient with me and helped guide me in the right direction with my build.I had them do the cams, lfters, springs, line locks and a tune on my 06 mustang and they did an excellent job, im very happy with the work they did. After everything was done they went out of their way to meet up with me at the track to make sure I was happy with the car. Even did some fine tuning for me on the spot I was amazed like who does that? I couldn't of asked for a better group of guys to work on my car.Prices were very fair and they did not try to sell me things I didn't need. They wanted to do what was best for my car and I appreciate them for the exallent work they preformed. I would recommend them to anyone!Services: Auto engine diagnostic, Auto engine tuning, Engine repair, Vehicle Inspection

  Mdavison11
a year ago
These guys did a great job working with my car. Took it to them after just rebuilding my engine, and had them tune the Ecm and Pcm to get it running properly. They ran into a small problem with it not pushing enough fuel, but they resolved the problem very quick. Very communicative and have great prices really appreciated Logan helping out.Services: Auto engine tuning, Auto maintenance

  Samir Afif
2 years ago
This Shop is under new owners and management team. I learned about this shop during COVID season and it was opened by Art Miller, and family.I took I-MEDUSA, my 2014 V6 Mustang, to them for engine modification tips. I was greeted and treated like a friend, better yet like a family member. I know nothing about car modification and I trusted my car and money with them. They have treated me well and took care of my needs. There had been times I went back for simple stuff and they had no problem taking care of me on the house.Let me tell you this. I see reviews regarding the old owner. Art Miller & Family are not him and they will treat you with the utmost respect. So, thank you Art, Mrs. Miller, Logan, and Charlie, for allowing me to feel as one with you. Services: Exhaust, Steering & suspension repair, General repairs & maintenance, Auto engine tuning, Engine repair

  Andrew
2 years ago
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!Service: ExhaustService: Exhaust

  James Morrison
a year ago
Terrific performance shop- I Scheduled a Dyno here, and they got me right in. While there, I expressed concerns regarding some previous tuning and error code issues (from another shops' work) and Logan dug right into it to solve the issues for me. Excellent Professionalism, customer service, communication, and quality work with attention to detail. An impressively run business. Glad i came here.

  johnny beelgle
a year ago
Had an awesome experience with this guys doing some exhaust modification on my TRX. The work was done promptly, the pricing was fair and the entire staff was friendly and welcoming. Will be coming back again

  Michele Kohl
a year ago
My family loves Miller Mountain. We drive two hours to have them look at our cars. Friendly, knowledgeable staff, trustworthy, reasonable prices and we always leave happy. I highly recommend them.Services: Transmission, Carburetor cleaning, Exhaust, Auto engine diagnostic, Auto engine tuning, Engine repair, Vehicle Inspection, Auto exhaust system replacement, Transmission repair, Auto emissions testing, Vehicle safety inspection, Auto brake replacement, Oil changeServices: Transmission, Carburetor cleaning, Exhaust, Auto engine diagnostic, Auto engine tuning, Engine repair, Vehicle Inspection, Auto exhaust system replacement, Transmission repair, Auto emissions testing, Vehicle safety inspection, Auto brake replacement, Oil change

  Wesley Francis
11 months ago
Was in a tight spot on a road trip with a broken wheel bolt. These guys stopped what they were doing to help me out and get me down the road. Nice honest people. Would recommend to anyone.

  Ralph Murgia
a year ago
Took my 77 corvette to Miller Mountain. Ran it on the dyno and they were immediately able to boost the horsepower to where I wanted it. Very professional and highly reliable! Great car business and boost to Pottstown!Services: Exhaust, Steering & suspension repair, General repairs & maintenance, Auto engine diagnostic, Auto engine tuning, BrakesServices: Exhaust, Steering & suspension repair, General repairs & maintenance, Auto engine diagnostic, Auto engine tuning, Brakes

  Jackson Sullivan
a year ago
I highly recommend this business, the owners and workers here take pride in there work along with have a passion for working on cars. If you need anything performance wise done to your vehicle definitely bring it down to MMHP! 10/10Services: Transmission, Exhaust, Electrical, Auto maintenanceServices: Transmission, Exhaust, Electrical, Auto maintenance

  Anthony Cummings
a year ago
The worst place if you have any love for your vehicle stay away from this Butcher ShopThey set my electric system on fire It's funny that respond so quickly but explain why my does don't open, when I brought it to you the passenger door worked fine. None of them worke at this point. You also said you changed the header gasket. That was a lie. You also said it was a lifter problem and you were dead wrong. It was the gasket leak because I changed it myself. Let's face it, you're nothing but a rip offSee you in COURTServices: Exhaust, Electrical, Auto engine diagnostic

  Philip Berardi
7 years ago
I took my 65 Thunderbird here to get it tuned up after an engine rebuild. Very impressed with the way it turned out. They took the time to explain to me what they did and when I should think about down the road. Shop had good communication throughout the whole thing so I knew when it would be ready.

  Dan DiNardo
7 years ago
Ray did an excellent job dyno-tuning my Supercharged 2003 Mustang vert. His prices are fair and reasonable, and he turned my purring kitten into a growling beast.I'll continue to take my car to take my vehicle here in the future. I'd highly recommend this shop.

  Tommy Brueningsen
a year ago
Saved my car and saved me a lot of time dealing with a bad tuner had me in and out within a week with the car in perfect condition they spent over 19 hours fixing the old tune that was on itServices: Electrical, Auto engine diagnostic, Auto engine tuningServices: Electrical, Auto engine diagnostic, Auto engine tuning

  Darin Garvey
5 years ago
I went to Ray for a Mustang C-4 Trans rebuild, he brought it to his "trans guy" named Charlie. They had the car for about 10 days, "Charlie" said it was low in oil remarked the dip stick and rebuilt the 1st and 2nd gear clutch packs. I had the car for 1 week with less then 5 miles on it and the trans gave me the same problem I brought it to him with. This is not track miles or passes, this is putting around my neighborhood tuning the car. Found out "Charlie" didn't Fix/Diagnose the trans properly, now I have a car with no 1st/2nd gear and I am out $2500.00. Furthermore they somehow disconnected the rear break lights and now I cannot figure it out. I cannot speak on the "New Owners" but I will not recommend that shop ever! Beware

  Pietro Manicioto
5 years ago
Very sketchy shop!The dyno did not even read a tach signal and did not give RPM. Therefor no TQ reading and no valuable HP calculation with not TQ or RPM.Also no wideband hookup.The dyno chart I paid $80 for shows incorrect HP figure by about 60whp, and TQ plot looks like it was scribbled all over the paper by a toddler and off by about 250ft/lbs of TqDid not make an attempt to fix the problem.It is obvious this is a 20+ yr old machine that has not been maintained.Upon payment the shop was not interested in addressing the issue. I left promptly as a police officer walked through the shop calling in warrants for employees.I called to speak with the owner about the issue afterwards and rude employee said read the sign of no refunds and we will just go to court if I file a charge back.I would avoid this shop! The prior owner was not the best business person but atleast the equipment mostly worked. Seems it has gotten worse with new ownership

  Mathew Mautz
5 years ago
Set up multiple pick up times/appointments no sense of organization. 3 sundays worth of planning all shot down without call on most recent at all. Drove 3hrs to come home to be there for actual appointment but no call. Won't be recommending this shop to anyone for anything more. Had one good experience before but this is just inexcusable even today was told to meet them at walmart and after getting there and waiting 15 minutes got a call saying they can't do it now.

  Eric Myers
a year ago
Very professional looked over the car very closely anything that it needed they let me know about it fixed any small problems that would effect the tune well definitely go back to themService: Auto engine tuningService: Auto engine tuning

  Jerry
a year ago
Good group of knowledgeable car guys. They know engines! Very happy with their advice and service.

  Charlie Zothner
a year ago
Great performance shop with an awesome dyno!Friendliest people and service you'll ever experience!Services: Auto engine diagnostic, Auto engine tuningServices: Auto engine diagnostic, Auto engine tuning

  Joseph Ball
6 years ago
Ray rebuilt my rear while i waited. Who else does that..and have it hold up to the way I drive. He also happens to be one of the coolest guys you will ever meet. Thanks Ray