Called and made an appointment to have the rear fenders rolled on my Evo X. Nothing but good things to say about this place. Professional and friendly. Dropped the car off... went to grab a bite to eat and do a little shopping and they called to let me know the car was ready. Great experience. Definitely recommend.

I have owned a C4 Corvette for nine years. Every time I needed a diagnosis and repair for my Corvette, I took it to Underground AutoSports. They have always provided first class service. Their entire staff was always courteous and professional. They offer a wide range of services, from routine repair, custom fabrication, race preparation and complete engine builds. I have recommended Underground AutoSports to fellow Corvette enthusiasts in the past and will continue to do so in the future. Thanks for years of great service.

Super knowledgeable and friendly staff. Wanted to get some slight work done on my car (fender rolling) but they gave me their pure honest perspectives with pros and cons.Will definitely keep this shop in mind once I get my hands on my Ford Gran Torino 😎

Underground Autosports is an amazing shop! I was originally looking around for a shop to supercharge my truck but it turned into much more over time. They were one of the only ones in the area that would do it with the tune I wanted, since Toyota has a very difficult ECU to work with. I was and continue to be, a very satisfied customer. Almost 2 years later and I have had Underground do just about everything imaginable to my truck. They installed my supercharger, 10 bullet proof lift kit, 37 tires with bead locks, motorized drop steps, new headlights, tail lights, winch system, exhaust and exhaust head actuator, mesh grill, light bar, fog lights, front and rear bumpers, front and rear end Yukon gears and full wiring for the new goodies. They far exceeded my expectations. There were some items that needed adjustment or tweaks here and there, which can fully be expected when installing after market parts, but Brandon and his team were always honest, punctual and ready to help explain the issues at hand. They also did a great job of keeping me updated every step of the way throughout each mini project of making this truck what it is today. Needless to say, I also have them do my every day maintenance (oil change, brakes etc) as no job is too big or small for them. I cannot thank the Underground Autosports team enough for making my dream truck a reality!

Took in my M3 for fluid changes and boost pipe replacement. Brandon was very welcoming and super helpful explaining the job. They tackled it no problem and will be coming back for future jobs.

Had a great experience with the shop and its crew! This is my first build and they made me feel comfortable with making design decisions! I would and will have more work done in the future!

Brandon supercharged my 2008 Miata, installed headers, full exhaust and modified the suspension. Now I go to him for regular maintenance and Ive been loving it for 2 years!

10/10 I couldnt have been happier with the customer service and quality of there work! Will be going back for all future tuning and mechanical needs! Thank all of you guys again!

Everybody was friendly, courteous and explained everything in detail to me. That work was done to perfection and my car is running better than ever

Would give zero stars if I could. Save yourself the time and money and find a better shop.

A great group of people that went above and beyond what the original task asked for. Will be coming back when I need more work done.

Brandon and Sean are serious enthusiasts, and their passion rubs off on everything they do around the shop. Im on a tight performance budget so I havent had the opportunity to engage the Underground team on any big builds, but I stop buy for parts and incidentals. These guys are just as willing to share ideas, tips and advice as if I was embarking on a 10K+ build. These guys are just awesome to work with! Highly recommended.

The only place I trust with my car. Had custom exhaust work done for a turbo setup and turned out beautiful. High quality work!

They’ve worked on my car twice now and have done quality work at a fair price. Very responsive to my phone calls and flexible with scheduling. I’ll take my car back again despite it being 45 minutes away

I found this place by accident but Im so happy to have found it. Its simply amazing! The work thats done here is the stuff Ive only seen on Gas Monkey and Motor Trend Channel, builds that are high end and better quality than you would expect. It really is the best kept secret in Schaumburg. Not only was I impressed by the cars I was even more impressed by the team of mechanics and management that make this place crank at what must be 1K hp!

Excellent service and quality! Truly honest and well informed.

High praise for an unusual ask. I had an unusual request for them. Not exactly their specialty. Brandon explained he could do the work, but recommended I try the original seller first for a replacement. He actually got on the phone and helped me negotiate a deal with the seller, getting me an original replacement (AT NO COST!) instead of fixing my current setup! I will gladly take my Family business there going forward. Not the most convenient location for me either...but trust goes a long way!

My experience with Underground Autosports was very positive. I needed some work done on a Saturn Ion (not great dealer support for this vehicle any more). The work was completed quickly and professionally, it was done for the quoted price and my problem was resolved. You cant ask for more than that. While this shop excels at custom work, they can take care of every day car problems too. Highly recommended, will be having all my automotive service done there.

Brandon over at underground does all my performance work. My car runs like a champ. Better, Stronger Faster. If you want high performance parts and installation performed by people who understand what is needed, this is the place to go. Their recommendations always give you the best results. Their dyno tuning is amazing. I only review The Best of the Best. I drive a Challenger SRT8 and these guys know what theyre doing. I only gave you the best of the best. Trust me, itll be the best decision you made in a long time. Follow me, Ill keep your car moving fast. Share and like.

Just got Borla Exhaust installed on a AWD Hemi Charger 5.7L V8. Borla themselves had told me that this exhaust system will not work for my car. Not too many people have a AWD charger and I was feeling hopeless with the lack of information on the web. My wife got disappointed too because it was suppose to be my birthday present. I reached out to Brendan and his crew at Underground. They offered free consultation and with their help we actually discovered that Borla gave me the wrong info! The exhaust worked just fine for AWD models.The installation went fine, very pleased with the new system effect. Very convenient location in Hoffman/Schaumburg area near Woodfield. Price is right for automobile mechanical work in the US.I saw multiple mustangs and Camaros sitting around getting worked on, as well as other much more luxurious vehicles. So I felt safe with my car been there along with all of the other owners. It will always be my go to place around Schaumburg, where I can improve my cars. You cant find this level of customization or trust at a manufacturer car dealership.---Adam Yu

The only place I trust with my car. Had custom exhaust work done for a turbo setup and turned out beautiful. High quality work!

Ive been to the shop many times. Quotes have been fair and accurate,Work always done on time, and the quality of the work has been excellent. I highly recommend Underground Autosports for both custom work and basic service.

I have taken my vehicles to Brandon and his team for 8 years. Even though it is a 30 minute commute one way, it is worth it because I know runs his company on Integrity and accuracy. I have referred many people to him over the years and have never heard anything but great satisfaction!

Ive had the opportunity to deal with Brandon and Underground on a couple of occasions...very professional and very detail oriented. Brandon will find a solution for your needs.

I contacted UA to ask about having a used car evaluated before purchase. Brandon advised me that they have a standard inspection and provide a 4 page Car Report Card for only $90 - and they could fit me in any time. When he heard the year and model I was considering he said Probably not worth buying or even spending the $$ for the report.Much appreciated. Thanks, UA!

Brandon and Perry,Ive been meaning to send this out sooner, but have been very busy with both work and a recent trip. I wanted to thank you guys again for getting my Miata transitioned from storage to track-ready so quickly a couple weeks ago. Initially, I didnt think Id have a chance to drive this year, but you guys allowed me to take advantage of a last minute opportunity. Thanks again for your prompt and friendly service.

Like the others said - avoid this place. I had my BMW 335is in for Cobb upgrades and they cracked the audio cover. Took a while to figure it out, but these hacks didnt own up to the damage they did. Oil all over the firewall. Huge mess. On my X5, I brought it in for some routine maintenance (before I know the audio cover was cracked) and the car was given back to me in limp mode with the dash full of alarms, but they didnt do it. Right... Cost me $2k for BMW to fix their mess. Plus, I paid for a coolant flush and BMW said there is no way that coolant was changed in the last year. Go anywhere else and avoid the nightmare.

This is the most trustworthy mechanic shop I have ever been to in my lifetime...always honest, on time, and they never over-commit in terms of when things will be ready.

Came in to have our freshly built supercharged motor tuned on their dyno. This was on a Friday and we had an autocross event the following day. Our build was strong but we ran into a few issues and the car was miss behaving. After some great troubleshooting they found a check valve had failed causing the crankcase to preasureize. With that fixed everything still wasn’t correct so more sleuthing discover a crack in our header. I thought that this was it and our weekend was done. But that wasn’t the case.The solution of welding the header was quickly floated and accepted. With these issues taken care of we could successfully be tuned. Even though this was a Friday that turned into Friday evening then into Friday night (there was a shop outing that was delayed do to the extra time required for our car) The staff was great and went up and beyond my expectations. I never felt they were rushing my project even though it was keeping them from leaving on their outing. By the time there were done our car was as close to perfect as it could get and my wife and I were able to run in the weekends autocross thaking second and third in our class.If you are looking for a shop to go the extra mile to get your car right and ready this is the place to go.i would also not hesitate having the, build out a car for us. Everyone is great, skilled and very communicative.

Jeremy tuned my 2016 mustang GT twin turbo and absolutely woke it up! I highly recommend Jeremy for your tuning needs.

Impressive shop. Amazing work. The owner is a great guy.

The owner went above and beyond to take care of my vehicle, highly impressed with the service received.

Great Job on my Mercedes 190E 2.5-16 Evolution build! Great communication and fair pricing.

I take my Porsche and Audi there for maintenance that I cant (or wont) trust myself to do on my own. I believe that Brandon and his crew are very personable and trustworthy and seem genuinely concerned with doing things the right way.

As others have mentioned, stay away from Underground Autosports. Quality left that building when the previous co-owner Perry departed. Total nightmare experience that ended with my completed Trans Am catching fire in their parking lot and needed to be towed home. This was after almost a year in their shop. This shop belongs on the evening news for their terrible practices.

Underground auto always gets the job done right!!! The staff is very knowledgeable!!! Very honest!!! I will always trust underground auto!!

Tuner doesnt know what hes doin but thinks he does. Had my truck running pig rich, spark plugs were fouled out, IAT Sensor was not plugged into intake tube causing erratic intake temps, Valve covers wernt put on, burning oil, Cam idle was set at 1150 rpm. I highly dont recommend this shop.

Had underground autosports install a turbocharger in my car, it was a premade kit that was supposed to bolt right up to the car. Was estimated to cost around $1100 (12 hours) not including the tuning, which I wasnt planning on having them do. As expected, some things needed adjusting; however, I got charged nearly four times the original estimate! On the night I received my car, they told me it was safe enough to drive.. meanwhile, about 2 hours later my car refused to start and transmission fluid was leaking all over the ground- one of the sensors was loose, and the transmission dipstick was installed incorrectly. I have asked them to fix the dipstick, but they refuse to do so without asking me for more money. For 4,000 dollars, I would have expected a flawless installation, especially since there was hardly any fabrication needed aside from the downpipe. I feel like I should have listened to what other people told me about this shop. I will not be returning and I definitely wouldnt recommend this shop.

I’ve been a customer of theirs for 5 years, Brandon has helped me with so many problems on all of my cars. I would recommend this place 10/10.

Avoid this place, they’ quote you one thing and run the clock out to charge you double! POS shop!

Parry and Brandon operate an awsome shop, they can handle everything from a full on Road Race car conversion to topping off your A/C and they do it all with professionalism, proficiency, and a politeness rarely seen in the automotive service industry today. These guys know their cars! While Im sure they would rather work on the new Laxus, BMW, MB, or Audi and they work wonders with modifying those platforms, but they also worked on my 1992 Thunderbird Super Coupe, not an easy car to work on and particularly so when its a midwest car with tendencies toward rusting.I would, and have, recomended these guys shop for anything you might need done to your car without reservation!

I got my car tuned back in June 2017, I wouldnt go anywhere else! Will be back this May for more work!

Since Jeremy has left I will no longer use underground I will follow him for my turning needs.

Very helpful!

Awesome place