They always do amazing work.with the crazy world with parts and not being able to get anything they are on top of it! they always do there best.

I have been dealing with CIS for years. They are great and do an awesome job.

Always have the pump that I need and Great people to do business with

Best Deals in town. Very knowledgeable and very helpful. Made me Feel very welcome.They also invited me to the injection room and watch them test my injectors.Awesome to see how everything works.Thanks guys. Will definitely recommend and use you for any injectors.

Great place

Worst not even worth a one star. A guy named Kyle Ripe us off we had a turbo rebuild from him and he put failed barring in the turbo and kept lying about that the car has issue. We paid $375 for no reason. I would say never go there they’ll steal money from you. I got the turbo rebuild from Ron’s Turbo service it’s perfectly fine. Cis turbo won’t even last 1 mile.

Certified injection is the best place in the state to help with your diesels fuel system. And their pricing is very fair. They have tested the injectors on 3 separate Ram diesels for me and have been super honest about the condition they have been in and never tried to upsell me on things that werent necessary. My father has also had several pumps and injectors from various trucks and equipment and they have never had any issues with their work. If you need work done on your diesel give them a call and you will not be dissapointed.

Guys were great to work with, Kyle was extremely helpful and knowledgeable, super great place to go for all your Diesel injector needs, would definitely recommend to anyone

Sold me a turbo for my Duramax. I installed it wrong and it was leaking oil. When I went back to them they gave me the advice I needed and they cleaned up my mess for me.

They have done quality work for lots of years. Accounts are available. I like working with Wally.

Came in with emergency radiator repairs on our school bus home/RV and, despite having an abundance of other work to do, Brock prioritized our situation and resolved the problem in less than an hour. Not only was the work top notch, Brock was an excellent conversationalist and seemed genuinely interested in our lives, our vehicle issue, and in gregarious socializing, not like our bus was just another pain-in-ass problem for him and his crew. Highly recommend this place to anyone in or near SLC.

Great guys and will take care of all your diesel needs.

If you have a diesel and it needs ANY kind of repair.GO HERE.I cant stress that enough. These guys have had the opportunity to screw us so many times and they havent. We own a fleet of diesel pickups and these guys have not only found the problem quickly, they have fixed it pronto and been ridiculously fair in what they have charged.5 Stars isnt enough.

These guys are the best around for anything fuel system related. Have worked with them a lot and have always been impressed by their quality and promptness.

Brock is awesome. Not like these other places that wont give you the time of day. Definitely recommend these guys.

Been dealing with And & Wallie for several years. Never had an issue and their always willing to help with tec support questions.

Good service and not bad prices, sure beats going to thermo king and getting ripped off

Great customer service!

Excellent service. Broke down on our way home to Louisiana and stopped in SLC. They gave us priority and did their best to get us back on the road as soon as possible. Two thumbs up for Brock & Andy! 👍🏼👍🏼

Terrible experience, went for a turbo repair here and a guy named Kyle completely ripped us off. Acted like he was giving us a deal when in reality he gave us a barring that failed and it only had been in our car for one day and then lied about it and says something is wrong with the car, when nothing is. Spent almost 400 dollars for nothing. Don’t go here.

Awesome service they know what they can do and how to help

Every time I have been there, the service is great and the prices are more than fair. i would highly recommend it to all my friends.

I highly recommend Certified Injection. Every time Ive been there, their prices are fair and service is outstanding.

Awesome! Saved us from having to get a $3000 replacement DPF. Highly recommend these guys they were great to work with!

Amazing place brock is the man. would recommend 10/10 saved my bands life!!!

They have been giving us exceptional service always for years!!

I had an oil leak that another shop couldnt find. Certified found and fixed it. I will definitely come back.

Been using Wally for his expertise since he opened in the 80s

This is a great shop with some respectful, intelligent guys. Its the only shop Ill use in Utah.

These guys know diesel and they make a quality product.

Brock knows what hes doing when it comes to 6.0 powerstroke, only guy i trust touching my truck. 4/26/17 0132

Customer service is fantastic and price is lower than other shops, they are honest and the techs are knowledgeable and will be happy to help when they can, i wont go anywhere but here.

Great service and pricing

Good guys to work with and great customer service!

Instead of throwing a ton of new parts at an issue and charging me a fortune, they found a short in a wiring harness and only charged me for 2 hours of labor. Only place i will bring my truck!!

Excellent service and the best prices around.

They know there stuff

Good shop