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February 2024 by Kassandra T
I have been working with Scott to get a preowned Porsche PPId. I’m from San Francisco area and Scott has gone above and beyond to facilitate the inspection. He’s forthcoming and very communicative. Highly recommend!
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September 2023 by SMP Bot
These guys are great! I brought a car to them 15+ years ago for tuning. Fabryce was friendly and knowledge, and helped me get set up. I come back because I had a good experience.
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November 2022 by Jonathan Crutchley
I cannot say enough good things about GMG. I brought a ‘96 993 to them for a PPI - it was worth every penny! The report, pictures and time they take to talk through what they found (and what they would replace) will get rid of any concern you might have about buying a classic Porsche. They’ve earnt my business for life!Service: Vehicle Inspection
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June 2022 by richard wilson
One look inside the stable and you know you've come to the right place with your high-end vehicle!! R&D done in house, used in their own cars and then made available to the open market. Excellent customer service and support!
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April 2022 by Bobby Aflatooni
I've had the GMG exhaust on three Porsche's and have loved them. Not only they sound and look great, GMG actually races the stuff they sell!
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November 2021 by Darren Wright
I cannot speak highly enough about this shop! I had a shop in Mesa, AZ install new KW coilovers upside down (yes, you read that correctly - see photo), on my BMW. With only a bit of weight in the car, it was topping out badly, and was on the verge of seriously damaging my car. I was in a panic, ...on a tight schedule and Allen at GMG squeezed me in. They repaired my car, installed new tires, set the height properly, and did an alignment. I want to mention, I had probably the cheapest car in their shop (by a factor :), and Allen and the GMG team treated me like I had the most expensive car in their shop. These guys are consummate professionals and I cannot speak highly enough about them! Don't look elsewhere - just go and experience for yourself! Thanks again Allen, and team GMG, you guys are awesome!Services: General repairs & maintenance
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November 2021 by Robert Matthews
So far so good. My Ferrari 458 Speciale is currently there. I spoke on the phone with Allen several times. I live in Ma and have spoken with several shops that deal with tuning Ferrari. The car is throwing a code due to an aftermarket exhaust. I want a tune and still need to pass inspection.....Allen really knows his stuff and is a pleasure to deal with! Looking forward to getting it back.
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November 2021 by Juan Solano
I just called to try to get information about the company's to make a quotation and the guy who picked up the phone just treat me like garbage and also insult me. What an unprofessional person OMG!!!
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September 2021 by Zaid Elian
Such an amazing place with an amazing staff plus and amazing work , all the respect to those people they stand for there word and honesty is there key.Scott helped me to tune my 992 and the amount of knowledge that this guy have with these cars is unbelievable ?Service: Auto engine tuning
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February 2021 by Robert M.
Looking for a Tuner for my 458 Speciale. I put an exhaust on on the car and it triggers a code..... If you are reading this you probably already know the story..... So..... I'm OCD.. i searched and researched and searched, bla bla bla.... Let's just say I do my homework before choosing a place. I talked to many tuners. Mostly all had good to great reviews and ratings. I finally called GMG and spoke to Allen... It didn't take more than 2 minutes to recognize he really knows Ferrari. He was extremely personable, and willing to help out, even b4 knowing he had my business. I live in MA! Allen really put my mind at ease that I was sending my car to the right place. Can't wait!
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February 2021 by Chris Taylor
PHENOMENAL knowledge and Customer Service. I was only there to get some brake calipers powder-coated and was treated like a VIP. Scott was SUPER cool and knowledgeable and the owner was awesome too.
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February 2021 by Trevor
Great quality and service. I don't let anyone work on my cars
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December 2020 by Steve navarro
GMG is a dream for any car enthusiast. Allen explained everything to me that he was going to do to my car and it turned out better than I expected. I would recommend them to anyone who wants performance and quality workmanship. I was blown away!911 Turbo S ownerSteve Navarro
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October 2020 by Alex Nagelschneider
I worked with GMG, specifically Scott, on a pre-purchase inspection for a 2019 GT3RS I was buying remotely from out of state. Given that I was working with him remotely I was a bit nervous, but Scott handled the PPI quickly, and found a couple items that needed to be done. He and his team very quickly took care of those items, and he stayed in communication with me via text and phone throughout the whole process, which was really appreciated. He even helped oversee the car being loaded on the transporter once all their work was done. Top class person to work with, and I wouldn’t hesitate to use GMG for any work I needed done in the future.
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August 2020 by Dave Y
Scott and Hector were very professional and timely. I'm very meticulous when it comes to my cars and I trust GMG to work on them. This was my first visit and look forward to a long relationship.