Nobody Builds A Hellcat Exhaust This Way: Our Gamble On A 997HP RAM TRX

The tune on this 997 horsepower Ram TRX was corrected by David Berry, who handles all your tuning issues and is who FMU wholeheartedly trusts for projects that need expert level calibration. Reach out here: https://www.heavydutyroadside.com/hdr... At Fluid MotorUnion in Naperville, Illinois, we build custom exhaust systems for the 2021 to 2026 Ram TRX, Dodge Challenger and Charger Hellcat, Redeye, Demon, Durango SRT Hellcat, and the full Gen 3 Hemi lineup including the 5.7, 6.1, 6.4 392, and the supercharged 6.2 Hellcat engine. This build covers a 997 horsepower Ram TRX running upgraded injectors, a pulley package, and E85, and it walks through why these cross-plane V8 engines are so hard to get sounding right. If you have ever searched for how to fix Hemi exhaust drone, why does my Hellcat sound raspy, best exhaust for a Ram TRX, TRX cat back vs axle back, 3.5 inch exhaust for a supercharged Hemi, or how to stop exhaust drone on a truck, this video breaks down the actual acoustic engineering behind the answer in plain shop-floor language, no engineering degree required. We explain the physics most shops skip: the cross-plane V8 firing order (1-8-4-3-6-5-7-2), the same-bank double-hit that creates the classic muscle car rumble and the harsh blat when you uncork it, exhaust pulse frequency and the cabin drone zone between 100 and 200 Hz, stepped header wave reflection theory from Burns Stainless and Performance Racing Industry, and why a megaphone at the collector is a constantly tapering step that treats the pressure wave at the source. Then we build the system backwards on purpose: megaphones at the header collectors, 3.5 inch pipe for flow and depth, mufflers in the middle of the truck, a smooth merge X-pipe after the muffling instead of before it, rear resonators, and a step-down for drone control. This is a full custom TRX exhaust fabrication with an X-pipe, megaphones, and a smooth merge crossover, tuned to sound like the Hemi muscle car heritage it came from, loud but refined and livable at highway cruise. This build also became a lesson in neural network tuning on the GPEC2A platform and why a box tune bundled with a performance package is not always the answer. David Berry at HDR Performance handled the calibration correction, and we cover HP Tuners, VE tables, the neural network airflow model, the HP Tuners Neural Network Trainer, Bank 1 lean faults, short term and long term fuel trims, cold start lambda decay, idle surging, and why we identified the tune problem before touching the exhaust, had the customer sign a liability release, and then paid to have it corrected to prove the fix. If you are researching Ram TRX exhaust, Hellcat exhaust build, custom exhaust fabrication near me, Hemi drone fix, TRX performance, supercharged Hemi tuning, HP Tuners neural network, Dusterhoff or box tune problems, E85 TRX tuning, or how a real shop diagnoses a lean condition on a supercharged truck, Fluid MotorUnion has been building exhaust systems and fixing cars since 2008. For expert level tuning and calibration, reach out to David Berry at HDR Performance: https://www.heavydutyroadside.com/hdr.... Subscribe for more custom exhaust builds, diagnostic deep dives, and honest breakdowns of what actually works and what does not. Stay loud, stay drone free. #RamTRX #Hellcat #Hemi #CustomExhaust #FluidMotorUnion #TRX #Xpipe #ExhaustBuild #HPTuners #Naperville #HDRPerformance #DavidBerry FMU Bad Driver Hoodie is NOW AVAILABLE! https://fluidmotorunion.com/product/b... Amazon affiliate store, where we post handy tools and products we like https://www.amazon.com/shop/influence... Check out Emer Kinsella: Film composer, classically-trained experimental violinist, and songwriter from Dublin, Ireland. She wrote our intro music! Listen:    / @emerkinsella   https://www.emerkinsella.com Contact: https://www.emersionmusic.com/contact Foreign | Domestic | Performance To book an appointment or find out more information, hit up our website or email/call: 🖥 - www.fluidmotorunion.com 📲 - (630) 305 3054 📩 - [email protected] 🎦 - Facebook.com/FMU 2108 W. Ferry Road Unit 102, Naperville IL 60563