Wow, this place is absolutely amazing, service is impeccable, friendly, professional and honest!! They took such good care of us and Grunt, my friends English Bulldog, we lost a tire on the interstate, he got us rite in and back on the road. Thank you Tsi!!

Went to TSI through referral. I was able to make an appointment to bring my truck in for maintenance work: oil and fuel filter change. Prices were fair and work completed in reasonable time. Friendly service. Will be back in the future.

These guys know what their doing on custom lifted trucks! Its nice to have actual professionals in my area who actually take the time for their customers. Very nice guys here. I usually do all my own work but you can definitely trust them with your rides!

Very helpful. They always make time for us!

Highly recommend. I had an emergency with my pick up, they worked me in, in a couple of days. Great work and great prices.

Hello my name is Sean, Had my truck there for a couple weeks and they was on top of there stuff. Have an 08 dodge that was acting up and had no idea what was wrong with it. They took care of it and didnt charge me an arm and a leg. Even got a phone call from the shop because they were worried I wasnt satisfied with the service. They will do anything to make sure their customers are 100% satisfied with their work.

If you drive a diesel then you need to know about TSI Diesel! I believe them to be the best around the northeast Tennessee area! Tyler and his mechanics know diesels! Maybe not the cheapest but the best! Fix it once and done!

Tyler and the guys are great to deal with...

Thanks for reaching out and making contact with me about the problems I had. I think we are on the right track to getting things straightened out and I appreciate your help. Look forward to doing more business with you.Update: Thanks Tyler, great service. Highly recommend these guys. Did everything possible to make sure I was taken care of. If you need parts or service on your truck, this is the place.

Great people,called them with a problem need air bags installed for my pick up worked me and got it fixed got me running when no one else in town would I recommend this place not just to my family but to my friends quality honestly they will get my business again and I cannot thank him enough for getting my pick up what it needed for a long trip to the west coast For a family emergency thank you once again

Tyler and his team do an amazing job. From performance products, to lift kits, to building motorcycles. They can do it all. Highly recommend!!

Super amazing shop with a great new location! Clean and neat super knowledgeable and friendly! Would recommend to anyone!

Brought my truck in for what I thought maybe an up exhaust issue on my 2008 f450 they looked at it and determined it was part of the EGR tube. They fixed the issue and did some general maintenance I asked for cleaning the k&n filter and changed the fuel filters. Very polite and professional team here and very satisfied with the work they performed and didnt have to pull the cab for the work I thought needed to be done. Thanks, I will be doing any engine work here from now on.

Great people!! They went above and beyond to get our truck fixed. Cant recommend them enough!!

“People It can be hard to find an honest, reliable and skilled mechanic but youll be very pleased if you take a chance on Tyler and his very knowledgeable staff.” Not only did they take care of what I needed with my truck, they were sensitive to my budget needs and went WAY above and beyond for me.I cant stress enough how much of a relief it is to be able to trust that Im not being sold unnecessary services and be able to drop off my vehicle and walk away with the knowledge that things will be taken care of appropriately. Five stars for customer service and price and being able to trust again!

I understand why people are complaining about customer service. I came in today needing a new transmission put in my truck pulled up to one of the stalls and the guys in there working on the vehicle are totally rude and the shop is a mess I wouldn’t send my worst enemy over there so I turned around drove out of there before I spend my hard-earned money there maybe put the office in front so you don’t have to deal with the mechanics because they obviously don’t want new people coming in to get their vehicle worked on. I’ve had other people tell me that if you know them you’ll get a decent deal but if you don’t they’ll just nickel and dime you to death so I’m glad I turned around went the other way thanks TSI

I was super pleased with the work I had done here. The guys were knowledgeable and the work was done quickly and way cheaper than the shops I had checked around nearby. I felt like they went out of their way to make sure I knew what i was getting, and even gave me support after the sale. Thanks again hopefully will be back for more!!!!

Overall the guys here were great got me fixed and back on the road actually a few days ahead of time. They were a little slow on communication but overall was a great experience will come back again thanks

I am new to the area so I’m new tsi. I had a turbo installed at tsi and it is working great. I have two turbos from other places in the year before. Still trying to fix other problems with the truck that was done elsewhere. Thanks guysI recently had all 8 injectors installed in a 05 Ford F 350 at a good price and a great warranty. The truck is running great like new for a change. Can’t say enough about how professional Tyler and David are. Tim

I brought my truck from another shop that I wont name. It was a mess, they basically had lied to me and charged me for parts that didnt fix the issue and ended up having completely different issues. TSI was a little behind which I understood, they ended up getting to my truck quicker than they said and now am back running and driving. Its nice to find an honest shop that wont charge you for things you dont need. I cant say enough good things about tyler and the guys thanks again

Fixed my 08 f250 quickly

Great guys who do great work. Diesels arent the only things these guys can do. I have a 2013 Ford Focus ST and these guys were able to help me out. If you have a question just call them and they can help you out.

I wouldnt let them work on a broken down lawn mower. They replaced up pipes that didnt need to be tried saying my fuel coolant pump was bad just cavitated and couldnt even connect the up pipe to the exhaust manifold correctly ended up having a real mechanic do it another thousand bucks. When approached about it tuler did the usual denial

They could fix stuff but evidently that is not their style - Instead they replace stuff that dont need replacing and charge you for it while the Hipster walks around bemoaning his life - run from this place, I wouldnt let them fix me a sandwich

Awesome customer service and answered any questions I had, would definitely recommend.

Showed up with no appointment, staff was friendly and very helpful. The owner actually got my issue resolved and helped get me back on the road. Would definitely go back again, big thanks to Tyler and the guys!

I tried to stop by today at 8:15 this morning and the gate was closed. I waited until 8:45 and left. Your facebook page shows you open at 8 and your google page says you open at 8:30. I would suggest making sure your business hours are listed correctly...

Great work and the owner and his employees were very helpful through the process. I came from Asheville NC area to have my truck worked on by these guys. Definitely would let them work on my truck again.

Excellent service and very knowledgeable group of guys, Eddie is an honest and passionate mechanic .

Have brought my vehicles here for years, always super honest and efficient. Thanks again for the work

They must do good work from the look of all the trucks that have custom work.But on 3 seperste occasions o entered the businesd and not one person even said hello.or can we help u..I ended up putting my lift kit on myself

Slow

Excellent work and great value from a top notch team. Along with honesty, integrity and excellence in service, I fully recommend TSi Diesel and Performance for service on any vehicle.

I cant say enough good things about TSI Diesel Performance and Offroad, they are literally the best mechanics Ive ever taken one of my vehicles to! I ended up in a serious predicament when my F350 blew a transmission and I had to tow our RV in 3 days (we live in the RV full-time). Not only was Tyler and his crew able to get a remanufactured transmission to the shop in just 2 days, he worked late to get it installed in my truck. We werent delayed in the slightest, and the new transmission performs perfectly - all for a lower price than I was quoted! Im amazed by this, because we arent TSIs primary customer type (stock truck, no performance upgrades) - but they treated my family and I better than any mechanic ever has. Long story short, if you have a diesel and youre within driving distance of them, let TSI work on your truck - they are awesome.

About a year ago now, I called TSI and asked if they did install of lift kits, they quickly said yes we sure do. I scheduled an appointment after buying a brand new 6in Rough Country Suspension lift kit and Brand 35in tires and brand new 20in rims. I asked how long it would take and they said 3 days. I was ok with that. After taking my truck to them and getting the work done...which mind you took almost 2 weeks...a lot longer than the original 5 days I was told right off the bat. I had issues right away, they broke my clock spring in my steering wheel and when asked they said oh thats how its supposed to feel, after I insisted they check it out thats when they said oh we broke it, sorry we will fix it, so I had to go back and spent another 6 hours with them to fix that because they clearly let a guy that has never done anything with lifts before mess with my truck. Then after driving around for one day I go to hit my brakes and hear metal grinding, that was my brake caliper hitting my rim when I hit the brakes because well the forgot to put a bolt back in the top of my caliper. Therefore scoring the inside of my brand new rim, in their defense they bought me a new rime, after I told him that his suggestion of just powder coating it was not gonna fly with me. lug nuts on my tires were even loose to the point where I could turn them with my hand. When I turn my steering wheel my abs kicks on and I even took it to them, they took it to Chevy and couldnt find an answer...this didnt happen before my lift was installed, and all they said was that it cant be fixed and sent me on my way. To this day I still have issues with my vehicle and I ended up stop taking my truck to them because I was tired of spending my days off at their shop and having no resolution to any of the problems with my truck and the lift they had installed on it. Ultimately they fired the guy that did install my lift kit because he messed up so bad. I would not take a vehicle here due to my experience and the time and time again having to go there, I even had to rent a vehicle at one point because they had my truck in pieces and it was never ready when they said it would be. This was a horrible Experience that I still am dealing with today and still finding things wrong with. If you need a truck lifted I would say go else where. They guys there are friendly, and the owner did buy me a new rim..but as far as the service goes and the quality of the work that was done I regret ever bringing my vehicle to them.

Nice work fast and friendly ppl

Great guys, worked with me too we figured out what was wrong with my truck.

Great experience with my car on the dyno

Good times

Great prices