BACK-TO-BACK DYNO TEST: 6.4L Hemi Gets Intake, Headers, Camshaft!

Build Your 6.4L HEMI Learn more about our Stage-1, Stage-2, and Stage-3 Naturally Aspirated 6.4L HEMI Packages: 👉 https://nationalspeedinc.com/packages... ✔ Available for Charger, Challenger, 300, Durango, Jeep, and RAM 6.4L HEMI models. 📞 Questions? Call us at (910) 332-5901 Ever wanted to see dyno data comparing intake, headers, and camshaft upgrades on a 6.4L HEMI -- all back-to-back? Yeah, we did too! This video explains, installs, tunes, and dyno tests our Stage-1, Stage-2, and Stage-3 Naturally Aspirated packages for the 6.4L HEMI -- all back-to-back on the same vehicle. Follow along as we take this 2021 Dodge Challenger R/T Scat Pack from showroom stock through Stage-1, Stage-2, and Stage-3, highlighting installation, dyno results, and horsepower gains every step of the way. Below are the current contents of each package covered (updated for 2026): Stage-1 • JLT Performance Series-II air-intake system • J&L air-oil separator • National Speed in-house ECU/PCM unlock (for 2015-2023 models) • SmartAccess cable (for 2018-2023 models) Stage-2 • All Stage-1 contents, plus: • Stainless Works Stainless Power 1.875" primary ID long-tube headers • OEM Mopar exhaust manifold gaskets Stage-3 • All Stage-1 & Stage-2 contents, plus: • Custom National Speed billet-core camshaft by Cam Motion • Cam Motion phase limiter • Brian Tooley Racing pushrods • Brian Tooley Racing valve springs • Brian Tooley Racing steel retainers • Brian Tooley Racing locks • Brian Tooley Racing spring seats • NGK Spark Plugs LZTR6AIX-13 spark plugs • OEM Mopar SRT Hellcat hydraulic valve lifters • OEM Mopar SRT Hellcat engine oil pump • OEM Mopar gaskets & seals • OEM Mopar MDS delete components • OEM Mopar fasteners • OEM Mopar coolant • Amsoil Signature Series 0W-40 synthetic engine oil • Lucas Oil Zinc-Plus break-in oil additive We want to hear from you! Contact Us: https://nationalspeedinc.com/contact Phone: (910) 332-5901 Connect with National Speed online: Subscribe to our YouTube channel:    / nationalspeedinc   Visit our Website: https://nationalspeedinc.com Like us on Facebook:   / nationalspeed   Follow us on Instagram:   / nationalspeed   00:00 - Intro 00:48 - Stage Breakdown 02:15 - Baseline 02:42 - Stage 1 Install 03:40 - Stage 1 Dyno 04:23 - Stage 2 Install 05:12 - Stage 2 Dyno 05:49 - Stage 3 Install 06:42 - Stage 3 Dyno 07:47 - Outro