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Chris Ehmke and Tim Mahoney are joined by someone you have heard a few times on this show, Josh McCormack! Josh fresh off his UCC win earlier this spring decided he was done with wowing the masses and put down a new record on the dyno. 4,157 HORSEPOWER. Insanity. He walks the boys through how he accomplished it and what you can expect to see out of him in the future. 

Chris Ehmke is joined by the lead tuner at Calibrated Power, Tim Mahoney, to discuss how the 2020+ Powerstroke 6.7 liter world is about to change. They discuss what this means for your 2020+ 6.7L, the ease at which tuning for the end user will be, and how adding 100+ HP is going to feel a lot different in these newer Powerstroke trucks. 

Show favorite, Chris Patterson, owner of Unrivaled Diesel, took second at the Ultimate Callout Challenge 2025! He sits to talk with host Chris Ehmke to discuss how grueling and how much it takes out of the competitors and their teams. The whole thing is about survival. Chris is a survivor, he put down a screaming 5.54 at the drags, 2,300 horsepower on the dyno, and 318 feet in the sled pull. He gives us all the details on this episode!

Josh McCormack has won the Ultimate Callout Challenge 2025! He joins Chris to discuss the weekend. Family man, YouTuber, and an overall great guy. Josh lef it all out there and came back with first place. He breaks down the weekend, his big 3,100+ horsepower dyno run, racing, and his Sunday at the pull. Congrats on the win, Josh!    Follow him on Instagram & TikTok: @justacommonrail24v YouTube: Horsetorques Diesel 

You have to see Patrick Brown's Cummins he is bringing to his first run at the UCC event. Chris sat down and talked with him about what he expects to see it do. Patrick is no stranger to competitions with having his eyes one time set on the Diesel Power Challenge nd having competed at King Of The Streets, he's ready to throw down at the UCC. Humble, determined, and doing wild things with such a cool Cummins, we are stoked to see what Patrick accomplishes this weekend!

One of the show's favorites is back, Robby Garcia joins Chris to discuss what he expects of his truck at this years UCC! This will be his 4th time competiting, a seasoned vet, and continually improving his results; these factors position Robby to finish quite high this year. One thing we know will happen, Robby will have a blast and bring that vibe to the whole field. Good luck, Robby!

Cody Hawk sits down with Chris on this episode! We get the scoop on the new competitor, from his roots with 7.3s to his preferred Duramax platform. He breaks down what he wants to see out of his truck at his first event. The man is in hustle mode and it's hard not to admire the drive and work ethic. Last year two spots on the podium were grabbed by rookies, will Cody continue the trend? We hope so, good luck Cody!

Chris has Mike Brown on this episode! Mike has ditched the mega cab in favor of a leaner regular cab, will it push him to the top? Mike left last year's UCC finishing third in his inaugural run at the competition. New Cummins, big win? We are excited to find out. Thanks for joining the show, Mike! 

Chris is joined by Colt Carter to discuss how the hell he went from rookie at the start of UCC 2024 to grabbing a 2nd-place finish. Colt is a gamer, and it's going to be fun to watch what his Cummins will do at the event this year. Another podium finish? One spot higher and grab the win? He's got what it takes. Be sure to check out Colt's shop as well, Black Magic Performance. 

Chris Patterson is back! The green Cummins from Texas that has thrown down 3,000 horsepower multiple times is ready for his final run at the UCC. Chris is a true competitor. He's taken first in the dyno portion of UCC, first in sled pulling, and as high as 2nd in the drag races. Will this be his year to finish atop the pack? He's got a damn good chance. Thanks for chatting with us Chris, we appreciate you. 

Josh McCormack joins Chris Ehmke to kick off our UCC 2025 driver interviews! As the official podcast of the Ultimate Callout Challenge, it's time to get to know the drivers. Josh discusses with Chris what he's looking forward to at this years competition. After taking a year off for family, Josh got the itch to compete again while watching the event last year on the live stream. Will he improve that 2nd place podium finish in 2023? He definitely looks like one of the strong contenders.

First things first, this is Paul Wilson's final episode on the Diesel Performance Podcast. Paul has been hosting this podcast and founded it since it's inception in 2015. Over 2 million downloads and millions of more listens. We can't thank Paul enough for all he's done. Thanks for the 10 years bro, we love you. Our episode today is with Kory Willis of PPEI. Paul and Chris discuss everything Kory knows about what is going on with the EPA and DOJ, how these things have effected his life in diesel tuning, and so much more. Kory is always one of our favorite guests and this episode is an absolute banger. Enjoy!

Paul Wilson and Chris Ehmke get behind the wheel of a 2025 Cummins and let you know how they feel about this 5thish? 6th Gen? Cummins.  New turbo ✓ Grid Heater... Out, Glow plugs In External injectors ✓ Side Draft Intake ✓ New 8-speed transmission✓ So how do the boys feel about it? Take a listen!

No more swapping ECMs, no more plugging in unlock cables. EZ Lynk has the goods where all you do is plug into the OBDII and flash your 2017-2023 L5P Duramax, and the custom tunes will flash without needing to do an unlock or ECM swap! Paul and Chris are joined by Tim Mahoney, the lead tuner at Duramaxtuner, to discuss the future of tuning now and what you can expect!

The little intricacies of what a diesel owner needs and utilizes his truck are something you always have to take into consideration when it comes to building mods and tuning.  How did that come into factor how the custom tuning of a the underpowered L5D come about? What about building the Stealth STR for these very specific 6500 Duramax trucks? Well, Nick gives you the minutia of detail right here!