Got a tune from Sean for my 2012 Ram 1500, and holy cow, it is a night and day difference from even the Diablo sport tunes. The truck just pulls and pulls and pulls. Had to buy a radar detector after having this installed. I’ve been running his tune for going on 2 years now, and have had absolutely 0 problems or complaints. Just had to buy tires sooner. Just get it, you won’t regret it.

I cannot say enough about Seth and his company. I recently decided to upgrade my Limited and add the Diablosport i3 with PCM swap. During the process I stumble across a thread talking about Hemi Fever Tuning. Skeptical at first, I purchased the Stage 1 tune and transmission tune. While waiting for the tune I loaded the canned 93 octane tune and drove to get a baseline. I could tell a difference but wasn’t anything crazy. Within 12 hours seth responded asking for required information. I immediately responded back with what he needed. Within 24 hours he responded with the tune and excellent instructions on loading to tuner, loading to truck, and what to data log on the test run (my first time data logging ). Loaded the tune when I got home from work at 5, data logged at about 8pm and sent the info the Seth around 9pm. To my surprise when I woke up the next morning he had studied logs and responded with a “run it” email. Let me say, the difference with his tune is eye opening. My truck is awake and shifts like a race car when at WOT. Knocked .5 seconds off 0-60 time. This guy knows what he is doing and is super helpful. 5 stars!!!! My next addition will be forced induction, and I will be returning.

The only thing i have to say is the people were atleast somewhat nice. My experience was this. I asked if a certain tune was able to be done and i was assured it could be. I then spent $570 to get a tuner and tune. I got my tune and we discovered it was doing my requested burble, but after a short time the burble would go away. After multiple data logs and one revision file that brought no fix, i was told “Theres nothing more we can do”. After being left with a semi broke tune and out $570, i took it to the forums to discover what could be wrong. I was referred to another company (who will remain unnamed) and they found the issue right away while comparing the same data logs and tune that were looked at at HemiFever while testing the issue. While I wont get into the details, it was the tune with the issue. I of course paid the other company to fix the tune and now the tune has been running as I was promised at HemiFever but didnt get. I find it really really unfortunate that I was left with a broken tune (after being told it could be done) and that they couldnt figure out what was wrong with their own tune. Just felt like I was kicked to the curb.

Contacted them by email to try and get a tune for my pro charged challenger. First response is we don’t really get into super chargers yet the top hemi is a supercharged power plant than get a response next saying checked the tune schedule and won’t be able to fit you in. Not hey can you come in about a month or two or to even try to schedule to get my car tuned. I am ready to invest another $2,000 into this car and they just flat out apparently don’t want supercharged hemis. Good news is since he refused me service I found an excellent guy that was recommended that is going to be able to take my car and fix all the tedious issues I have with it.

Sean is awesome at what he does. I don’t care how stock your Hemi is.. his tunes are a must! And trust me… spend the $75 on the transmission tune.. worth every penny! Thanks Sean for your outstanding tuning and customer support !Tim

Just left from getting a tune by Sean at Hemifever, and its like Im driving a different truck already! Im impressed. The customer service is excellent as well. Thanks again!

Outstanding service. Not only did I get same day email delivery on my tune, since I already had a Diablosport device, I got great followup support through datalogging. Well done, Sean!

SeanI can not thank you enough you guys gave me a totally new car ... thank you cant wait to do more business

Excellent service - Sean is an industry respected guy and lives performance. His knowledge is second to none and certainly helped wake my Ram 1500 up. Too often tuners will chase peak numbers, but what I truly value with Sean is providing a solid enjoyable tune that works as a daily driver - all within safety margins that aren’t going to hurt your vehicle. If you’re on the fence about tuning your Mopar, I’d definitely recommend dropping these guys a note.

Woke my truck right up. Worth every penny

I bought a tuner 5 years ago from Hemi Fever for my stock Dodge and never used it. Emailed Sean 5 years later and asked if he would still tune it and he did it no questions asked and worked with me until it was set perfect. Knocked 7/10th of second off 0-60 time! Sean is great, and really helpful. Recommend Hemi Fever all the way!

Sean is super friendly and knowledgeable

Well