{"product_id":"gm-geniii-and-gen4-450hp-truck-tune","title":"1999–2013 Silverado \/ Sierra \/ Yukon \/ Denali (4.8L, 5.3L, 6.0L ETC | Sloppy Mechanics Stage 3 Cam Tune Files | 450HP | HP Tuners Required)","description":"\u003cp\u003e\u003clink rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\"\u003e \u003clink href=\"https:\/\/fonts.googleapis.com\/css2?family=Barlow+Condensed:wght@700;900\u0026amp;family=Barlow:wght@400;500;600;700\u0026amp;display=swap\" rel=\"stylesheet\"\u003e\u003c\/p\u003e\n\u003cstyle\u003e\n#jrj-pd-450truck {\n  font-family: 'Barlow', sans-serif;\n  background: #111318;\n  color: #E8EDF2;\n  font-size: 16px;\n  line-height: 1.65;\n  padding: 48px 24px;\n}\n\n#jrj-pd-450truck * { box-sizing: border-box; margin: 0; padding: 0; }\n#jrj-pd-450truck a { color: #FF5A00; text-decoration: none; }\n#jrj-pd-450truck a:hover { text-decoration: underline; }\n\n.t450-wrap { max-width: 960px; margin: 0 auto; }\n\n.t450-eyebrow {\n  display: inline-flex; align-items: center; 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line-height: 1.7; }\n.t450-video-cta strong { color: #fff; font-size: 17px; }\n\n.t450-btn {\n  display: inline-flex; align-items: center; gap: 10px;\n  font-family: 'Barlow Condensed', sans-serif; font-weight: 700;\n  font-size: 17px; letter-spacing: .6px; text-transform: uppercase;\n  background: #FF5A00; color: #fff; padding: 15px 28px;\n  border-radius: 12px; white-space: nowrap;\n  box-shadow: 0 6px 20px rgba(255,90,0,.28);\n  transition: filter .15s, transform .15s; flex-shrink: 0;\n}\n.t450-btn:hover { filter: brightness(1.1); transform: translateY(-1px); text-decoration: none; }\n\n@media (max-width: 640px) {\n  #jrj-pd-450truck { padding: 28px 16px; }\n  .t450-title { font-size: 36px; }\n  .t450-grid { grid-template-columns: 1fr; }\n}\n\u003c\/style\u003e\n\u003cdiv id=\"jrj-pd-450truck\"\u003e\n\u003cdiv class=\"t450-wrap\"\u003e\n\u003cdiv class=\"t450-eyebrow\"\u003ePre-Written Tune File · High Performance Build\u003c\/div\u003e\n\u003ch2 class=\"t450-title\"\u003eUltimate GM 450HP Truck Tune\u003c\/h2\u003e\n\u003cdiv class=\"t450-subtitle\"\u003eGenIII + GenIV LS Trucks · One File. No Variants. Just Results.\u003c\/div\u003e\n\u003cdiv class=\"t450-vehicles\"\u003e4.8L · 5.3L · 6.0L · Silverado · Sierra · Tahoe · Suburban · Yukon · Avalanche · Escalade\u003c\/div\u003e\n\u003cp class=\"t450-lead\"\u003eThis is the \u003cstrong\u003eUltimate GM 450HP pre-written tune file\u003c\/strong\u003e — built from a real-world combo and countless hours of dialing in GenIII and GenIV trucks. If you're running a rowdy cammed LS truck and you want it to \u003cstrong\u003estart clean, idle mean, and pull hard\u003c\/strong\u003e, this is the file. No guesswork, no generic pulled calibration — developed on a real 450HP street truck and refined for your exact setup.\u003c\/p\u003e\n\u003c!-- PLATFORMS --\u003e\n\u003cdiv class=\"t450-platforms\"\u003e\n\u003cdiv class=\"t450-platform\"\u003e⚙️ HP Tuners MPVI2 \/ MPVI3 \/ MPVI4\u003c\/div\u003e\n\u003cdiv class=\"t450-platform\"\u003e💾 EFI Live — GenIII \/ GenIV\u003c\/div\u003e\n\u003cdiv class=\"t450-platform\"\u003e🖥️ Windows + VCM Suite Required\u003c\/div\u003e\n\u003cdiv class=\"t450-platform\"\u003e🎫 HP Tuners Credits Required\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- BUILD SPECS --\u003e\n\u003cdiv class=\"t450-box\"\u003e\n\u003ch4\u003eBuilt Around a Proven 450HP Combo\u003c\/h4\u003e\n\u003cp style=\"font-size: 15px; color: #8b94a3; margin-bottom: 18px; line-height: 1.6;\"\u003eThe demo truck used to develop this file is a serious street build — no theory, no guesswork:\u003c\/p\u003e\n\u003cul class=\"t450-list\"\u003e\n\u003cli\u003e\u003cstrong\u003eSloppy Mechanics Stage 3 Camshaft\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTBSS Intake Manifold\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCold Air Intake\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eLong Tube Headers\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHigh-Flow Y-Pipe \u0026amp; Free-Flowing Exhaust\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Engine Tune AND Transmission Tune\u003c\/strong\u003e — both included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- WHAT IT DELIVERS --\u003e\n\u003cdiv class=\"t450-box\"\u003e\n\u003ch4\u003eWhat This Tune Delivers\u003c\/h4\u003e\n\u003cul class=\"t450-highlights\"\u003e\n\u003cli\u003e\n\u003cspan class=\"t450-icon\"\u003e✅\u003c\/span\u003e\u003cspan\u003eAggressive, consistent \u003cstrong\u003e450HP-capable calibration\u003c\/strong\u003e for GenIII \u0026amp; GenIV LS trucks\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"t450-icon\"\u003e✅\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eClean cold start\u003c\/strong\u003e with a hard, controlled chop once the engine is up to temp\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"t450-icon\"\u003e✅\u003c\/span\u003e\u003cspan\u003eFixes the \u003cstrong\u003ebucking, surging, and stalling\u003c\/strong\u003e you get after a big cam install\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"t450-icon\"\u003e✅\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSharper throttle response\u003c\/strong\u003e without turning the truck into a light switch\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"t450-icon\"\u003e✅\u003c\/span\u003e\u003cspan\u003eOptimized \u003cstrong\u003espark, fueling, and airflow\u003c\/strong\u003e for Sloppy Stage 3 and similar cam grinds\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"t450-icon\"\u003e✅\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTransmission tuning\u003c\/strong\u003e that firms up shifts without beating up the drivetrain\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- VIDEO --\u003e\n\u003cdiv class=\"t450-video\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/2S2GzzjOjrI\" title=\"Ultimate GM 450HP Truck Tune In Action\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003c!-- COMPATIBILITY + REQUIREMENTS --\u003e\n\u003cdiv class=\"t450-grid\"\u003e\n\u003cdiv class=\"t450-box\"\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cul class=\"t450-list\"\u003e\n\u003cli\u003eGM GenIII \u0026amp; GenIV LS Trucks — \u003cstrong\u003e4.8L \/ 5.3L \/ 6.0L\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSilverado \/ Sierra 1500 \u0026amp; HD (Classic \u0026amp; New Body)\u003c\/li\u003e\n\u003cli\u003eTahoe, Suburban, Yukon, Denali, Avalanche, Escalade\u003c\/li\u003e\n\u003cli\u003eBest suited for \u003cstrong\u003ebig-cam, full bolt-on builds\u003c\/strong\u003e similar to the demo combo\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"t450-box\"\u003e\n\u003ch4\u003eRequirements\u003c\/h4\u003e\n\u003cul class=\"t450-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eHP Tuners MPVI2 \/ MPVI3 \/ MPVI4\u003c\/strong\u003e or EFI Live interface\u003c\/li\u003e\n\u003cli\u003eHP Tuners credits \/ EFI Live licenses — \u003cstrong\u003enot included\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWindows laptop with VCM Suite or EFI Live software\u003c\/li\u003e\n\u003cli\u003eBasic familiarity with reading, flashing, and saving tune files\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- WHAT WE NEED --\u003e\n\u003cdiv class=\"t450-box\"\u003e\n\u003ch4\u003eWhat We Need From You\u003c\/h4\u003e\n\u003cul class=\"t450-list\"\u003e\n\u003cli\u003eAfter purchase, \u003cstrong\u003eemail your HP Tuners or EFI Live factory read file\u003c\/strong\u003e to \u003ca href=\"mailto:Tunes@jrjonesracing.com\"\u003eTunes@JRJonesRacing.com\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eInclude your \u003cstrong\u003eorder number and full mod list\u003c\/strong\u003e — cam, intake, headers, exhaust, injectors, converter, etc.\u003c\/li\u003e\n\u003cli\u003eConfirm your \u003cstrong\u003eengine size\u003c\/strong\u003e (4.8L, 5.3L, or 6.0L) and transmission type\u003c\/li\u003e\n\u003cli\u003eTypical turnaround: \u003cstrong\u003eminutes\u003c\/strong\u003e — up to \u003cstrong\u003e24 hours\u003c\/strong\u003e depending on workload\u003c\/li\u003e\n\u003cli\u003eUp to \u003cstrong\u003e3 revisions included\u003c\/strong\u003e if your setup needs follow-up adjustments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- WARNING --\u003e\n\u003cdiv class=\"t450-warning\"\u003e\n\u003ch4\u003e⚠️ Flashing \u0026amp; Safety Notice\u003c\/h4\u003e\n\u003cp\u003eFlashing a PCM\/TCM always carries risk if done incorrectly. To protect your hardware:\u003c\/p\u003e\n\u003cul class=\"t450-list\" style=\"margin-bottom: 14px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eNever flash over Bluetooth or Wi-Fi\u003c\/strong\u003e — use a hard-wired USB connection only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect a battery charger\u003c\/strong\u003e to maintain stable voltage during the write process\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo not cycle the key, unplug cables, or move the laptop\u003c\/strong\u003e during the write\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eJ.R. Jones Automotive \u0026amp; Performance\u003c\/strong\u003e is not liable for any PCM\/TCM damage caused by unsafe flashing practices or hardware failures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- VIDEO CTA --\u003e\n\u003cdiv class=\"t450-video-cta\"\u003e\n\u003cp\u003e\u003cstrong\u003eNeed help sending your tune file?\u003c\/strong\u003e\u003cbr\u003eWatch our step-by-step video on how to read your stock file using HP Tuners and email it in for calibration.\u003c\/p\u003e\n\u003ca class=\"t450-btn\" href=\"https:\/\/youtu.be\/4Asty8NNCqM\" target=\"_blank\"\u003e▶ Watch How-To Video\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"J.R. Jones Racing","offers":[{"title":"Default Title","offer_id":42769568268355,"sku":null,"price":349.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0659\/1964\/7811\/files\/ChatGPTImageDec2_2025_08_20_08PM.png?v=1764724951","url":"https:\/\/jrjonesracing.com\/products\/gm-geniii-and-gen4-450hp-truck-tune","provider":"J.R. Jones Racing","version":"1.0","type":"link"}