{"product_id":"speed-engineering-1-3-4-longtube-headers-1999-2006-silverado-sierra-ls-truck-headers","title":"Speed Engineering 1 3\/4\" Longtube Headers – 1999–2006 Silverado \u0026 Sierra LS Truck Headers","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 {\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 * { box-sizing: border-box; margin: 0; padding: 0; }\n#jrj-pd a { color: #FF5A00; text-decoration: none; }\n#jrj-pd a:hover { text-decoration: underline; }\n\n.pd-wrap {\n  max-width: 960px;\n  margin: 0 auto;\n}\n\n.pd-eyebrow {\n  display: inline-flex;\n  align-items: center;\n  gap: 10px;\n  font-family: 'Barlow Condensed', sans-serif;\n  font-size: 14px;\n  font-weight: 900;\n  letter-spacing: 2.5px;\n  text-transform: uppercase;\n  color: #FF5A00;\n  margin-bottom: 16px;\n}\n\n.pd-eyebrow::before {\n  content: '';\n  display: block;\n  width: 24px;\n  height: 3px;\n  background: #FF5A00;\n  border-radius: 2px;\n}\n\n.pd-title {\n  font-family: 'Barlow Condensed', sans-serif;\n  font-weight: 900;\n  font-size: 48px;\n  text-transform: uppercase;\n  color: #fff;\n  line-height: 1;\n  letter-spacing: -.3px;\n  margin-bottom: 16px;\n}\n\n.pd-lead {\n  font-size: 17px;\n  color: #8B94A3;\n  max-width: 860px;\n  margin-bottom: 32px;\n  line-height: 1.75;\n}\n\n.pd-lead strong { color: #E8EDF2; }\n\n.pd-grid {\n  display: grid;\n  grid-template-columns: 1fr 1fr;\n  gap: 16px;\n  margin-bottom: 16px;\n}\n\n@media (max-width: 640px) {\n  .pd-grid { grid-template-columns: 1fr; }\n  .pd-title { font-size: 36px; }\n}\n\n.pd-box {\n  background: #16191F;\n  border: 1px solid rgba(255,255,255,.09);\n  border-radius: 16px;\n  padding: 28px;\n}\n\n.pd-box h4 {\n  font-family: 'Barlow Condensed', sans-serif;\n  font-weight: 900;\n  font-size: 20px;\n  text-transform: uppercase;\n  letter-spacing: .5px;\n  color: #fff;\n  margin-bottom: 18px;\n  display: flex;\n  align-items: center;\n  gap: 10px;\n}\n\n.pd-box h4::before {\n  content: '';\n  display: block;\n  width: 4px;\n  height: 20px;\n  background: #FF5A00;\n  border-radius: 2px;\n  flex-shrink: 0;\n}\n\n.pd-list {\n  list-style: none;\n  display: flex;\n  flex-direction: column;\n  gap: 12px;\n}\n\n.pd-list li {\n  font-size: 16px;\n  color: #8B94A3;\n  padding-left: 0;\n  position: relative;\n  line-height: 1.6;\n}\n\n.pd-list li::before {\n  content: none;\n}\n\n.pd-list li strong { color: #E8EDF2; 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}\n.pd-warning strong { color: #E8EDF2; }\n\n.pd-details {\n  background: #16191F;\n  border: 1px solid rgba(255,255,255,.09);\n  border-radius: 16px;\n  overflow: hidden;\n  margin-bottom: 16px;\n}\n\n.pd-details[open] { border-color: rgba(255,90,0,.3); }\n\n.pd-summary {\n  cursor: pointer;\n  list-style: none;\n  display: flex;\n  align-items: center;\n  justify-content: space-between;\n  gap: 12px;\n  padding: 22px 28px;\n  font-family: 'Barlow Condensed', sans-serif;\n  font-weight: 900;\n  font-size: 20px;\n  text-transform: uppercase;\n  letter-spacing: .5px;\n  color: #fff;\n  user-select: none;\n}\n\n.pd-summary::-webkit-details-marker { display: none; }\n\n.pd-chevron {\n  color: #FF5A00;\n  font-size: 24px;\n  font-weight: 900;\n  transition: transform .2s;\n  flex-shrink: 0;\n}\n\n.pd-details[open] .pd-chevron { transform: rotate(90deg); }\n\n.pd-vehicle-grid {\n  display: grid;\n  grid-template-columns: 1fr 1fr;\n  gap: 10px 32px;\n  padding: 20px 28px 28px;\n  border-top: 1px solid rgba(255,255,255,.09);\n}\n\n@media (max-width: 640px) {\n  .pd-vehicle-grid { grid-template-columns: 1fr; }\n}\n\n.pd-vehicle-grid li {\n  font-size: 15px;\n  color: #8B94A3;\n  list-style: none;\n  padding-left: 0;\n  position: relative;\n  line-height: 1.6;\n}\n\n.pd-vehicle-grid li::before {\n  content: none;\n}\n\n.pd-video-cta {\n  background: #16191F;\n  border: 1px solid rgba(255,255,255,.09);\n  border-radius: 16px;\n  padding: 28px;\n}\n\n.pd-video-cta p {\n  font-size: 16px;\n  color: #8B94A3;\n  line-height: 1.7;\n}\n\n.pd-video-cta strong { color: #fff; font-size: 17px; }\n\u003c\/style\u003e\n\u003cdiv id=\"jrj-pd\"\u003e\n\u003cdiv class=\"pd-wrap\"\u003e\n\u003cdiv class=\"pd-eyebrow\"\u003eSpeed Engineering Headers\u003c\/div\u003e\n\u003ch2 class=\"pd-title\"\u003e1 3\/4\" Longtube Headers\u003c\/h2\u003e\n\u003cp class=\"pd-lead\"\u003eThese \u003cstrong\u003eSpeed Engineering 1 3\/4\" longtube headers\u003c\/strong\u003e are designed for \u003cstrong\u003e1999-2006 GM Silverado, Sierra, and SUV applications\u003c\/strong\u003e, delivering proven performance gains, excellent fitment, and high-quality construction at an affordable price point. Built from durable \u003cstrong\u003e304 stainless steel\u003c\/strong\u003e, these headers are a solid upgrade for \u003cstrong\u003eLS-based street and performance builds\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cdiv class=\"pd-variants\"\u003e\n\u003cdiv class=\"pd-variant\"\u003e\n\u003cdiv class=\"pd-variant-icon\"\u003e💨\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eBalanced Longtube Design\u003c\/b\u003e \u003cspan\u003eBuilt to improve exhaust scavenging, increase airflow, and support strong gains on LS truck platforms with a street-friendly 1 3\/4-inch primary size.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-variant\"\u003e\n\u003cdiv class=\"pd-variant-icon\"\u003e🏁\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eBudget-Friendly Performance\u003c\/b\u003e \u003cspan\u003eA proven upgrade for street and performance builds looking for stronger power, sound, and throttle response without breaking the budget.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-grid\"\u003e\n\u003cdiv class=\"pd-box\"\u003e\n\u003ch4\u003ePart Number\u003c\/h4\u003e\n\u003cul class=\"pd-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed Engineering:\u003c\/strong\u003e SPD-7513\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-box\"\u003e\n\u003ch4\u003eProduct Features\u003c\/h4\u003e\n\u003cul class=\"pd-list\"\u003e\n\u003cli\u003eFull \u003cstrong\u003e1 3\/4\"\u003c\/strong\u003e mandrel-bent primary tubes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3\"\u003c\/strong\u003e collector for improved exhaust flow\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e304 stainless steel\u003c\/strong\u003e construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIG welded\u003c\/strong\u003e for strength and durability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC machined flanges\u003c\/strong\u003e for precise fitment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMerge spikes\u003c\/strong\u003e for improved exhaust scavenging\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace version\u003c\/strong\u003e with no AIR or EGR provisions\u003c\/li\u003e\n\u003cli\u003eIncludes standard \u003cstrong\u003egraphite manifold gaskets\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-grid\"\u003e\n\u003cdiv class=\"pd-box\"\u003e\n\u003ch4\u003eEngine Compatibility\u003c\/h4\u003e\n\u003cul class=\"pd-list\"\u003e\n\u003cli\u003eFits \u003cstrong\u003eGM LS-based V8 engines\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e4.8L\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e5.3L\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e6.0L\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-box\"\u003e\n\u003ch4\u003eVehicle Compatibility\u003c\/h4\u003e\n\u003cul class=\"pd-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e1999-2006 Chevrolet Silverado\u003c\/strong\u003e 2WD \u0026amp; 4WD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1999-2006 GMC Sierra\u003c\/strong\u003e 2WD \u0026amp; 4WD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1999-2006 Chevrolet Tahoe\u003c\/strong\u003e 2WD \u0026amp; 4WD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1999-2006 GMC Yukon\u003c\/strong\u003e 2WD \u0026amp; 4WD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2002-2006 Cadillac Escalade\u003c\/strong\u003e 2WD \u0026amp; 4WD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2002-2006 Cadillac EXT\u003c\/strong\u003e 2WD \u0026amp; 4WD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2002-2006 Chevrolet Avalanche\u003c\/strong\u003e 2WD \u0026amp; 4WD\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-grid\"\u003e\n\u003cdiv class=\"pd-box\"\u003e\n\u003ch4\u003eCommon Applications\u003c\/h4\u003e\n\u003cul class=\"pd-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eStreet performance\u003c\/strong\u003e builds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamshaft upgrade\u003c\/strong\u003e setups such as Chopacabra, Truck Norris, etc.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDOD\/AFM delete\u003c\/strong\u003e builds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull exhaust system\u003c\/strong\u003e upgrades\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-box\"\u003e\n\u003ch4\u003ePerformance Benefits\u003c\/h4\u003e\n\u003cul class=\"pd-list\"\u003e\n\u003cli\u003eGain of \u003cstrong\u003e25+ rear wheel horsepower\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eImproved \u003cstrong\u003eexhaust flow and engine efficiency\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eBetter \u003cstrong\u003ethrottle response\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEnhanced \u003cstrong\u003eexhaust sound\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pd-warning\"\u003e\n\u003ch4\u003eImportant Fitment Notes\u003c\/h4\u003e\n\u003cp\u003eThese headers are designed for \u003cstrong\u003eV8 applications only\u003c\/strong\u003e and some combinations may require minor modifications for proper installation.\u003c\/p\u003e\n\u003cul style=\"margin-bottom: 10px;\" class=\"pd-list\"\u003e\n\u003cli\u003e\u003cstrong\u003eDesigned for V8 applications only\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eSome \u003cstrong\u003e4L80E transmissions\u003c\/strong\u003e may require minor bellhousing clearance\u003c\/li\u003e\n\u003cli\u003eSome \u003cstrong\u003e2500 models\u003c\/strong\u003e may have clearance issues due to chassis differences\u003c\/li\u003e\n\u003cli\u003eMost \u003cstrong\u003e6.0 applications with 2-into-1 exhaust\u003c\/strong\u003e will require modification\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFor off-road and competition use only.\u003c\/strong\u003e Not legal for use on public roads or emissions-controlled vehicles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdetails class=\"pd-details\"\u003e\n\u003csummary class=\"pd-summary\"\u003e\u003cspan\u003eInstallation Information\u003c\/span\u003e \u003cspan class=\"pd-chevron\"\u003e›\u003c\/span\u003e\u003c\/summary\u003e\n\u003cul class=\"pd-vehicle-grid\"\u003e\n\u003cli\u003eProfessional installation recommended\u003c\/li\u003e\n\u003cli\u003eTuning required for optimal performance\u003c\/li\u003e\n\u003cli\u003eCheck clearance before final install\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/details\u003e\n\u003cdiv class=\"pd-video-cta\"\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e\u003cbr\u003eThese headers are a \u003cstrong\u003eproven budget-friendly performance upgrade\u003c\/strong\u003e for GM trucks and SUVs. When paired with proper tuning, they deliver significant gains in \u003cstrong\u003epower, sound, and overall drivability\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"J.R. Jones Racing","offers":[{"title":"Headers Only","offer_id":43120260317251,"sku":null,"price":329.99,"currency_code":"USD","in_stock":true},{"title":"With Speed Engineering Off-Road Y-Pipe","offer_id":43120256352323,"sku":null,"price":529.99,"currency_code":"USD","in_stock":true},{"title":"With LS Manifold Gaskets","offer_id":43120256385091,"sku":null,"price":369.99,"currency_code":"USD","in_stock":true},{"title":"With Header Bolts","offer_id":43120256417859,"sku":null,"price":345.99,"currency_code":"USD","in_stock":true},{"title":"With All Extras","offer_id":43120256450627,"sku":null,"price":569.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0659\/1964\/7811\/files\/Headers.webp?v=1775497289","url":"https:\/\/jrjonesracing.com\/products\/speed-engineering-1-3-4-longtube-headers-1999-2006-silverado-sierra-ls-truck-headers","provider":"J.R. Jones Racing","version":"1.0","type":"link"}