{"product_id":"pdi-big-boss-exhaust-manifold-cummins-isx15-x15","title":"PDI Big Boss Exhaust Manifold – Cummins ISX15 \/ X15 (2010–2024)","description":"\u003ch2\u003ePDI Big Boss Exhaust Manifold – Cummins ISX15 \/ X15\u003c\/h2\u003e\n\n\u003cp\u003e\nThe PDI Big Boss Exhaust Manifold is one of the most popular performance upgrades available for Cummins ISX15 and X15 engines. Engineered to maximize exhaust flow and improve turbocharger efficiency, this premium manifold helps reduce turbo lag, lower exhaust gas temperatures (EGTs), and improve overall engine performance.\n\u003c\/p\u003e\n\n\u003cp\u003e\nUnlike factory manifolds that are prone to cracking, warping, and heat-related failures, the PDI Big Boss Manifold is manufactured from High Silicon Molybdenum Ductile Iron (HSMD), a superior material designed to withstand extreme heat cycles and heavy-duty commercial trucking conditions. Every runner is engineered and tested to provide balanced exhaust flow to the turbocharger, helping improve boost response and engine efficiency.\n\u003c\/p\u003e\n\n\u003cp\u003e\nWhether you're an owner-operator looking for improved fuel economy or a fleet seeking greater reliability, the PDI Big Boss Exhaust Manifold delivers proven performance and durability for Cummins ISX15 and X15 engines. :contentReference[oaicite:0]{index=0}\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eDirect replacement for factory Cummins ISX15 and X15 exhaust manifolds\u003c\/li\u003e\n\n\u003cli\u003eUp to 20% increase in airflow over stock manifolds\u003c\/li\u003e\n\n\u003cli\u003eReduces turbo lag and improves throttle response\u003c\/li\u003e\n\n\u003cli\u003eLowers exhaust gas temperatures by 75–100°F\u003c\/li\u003e\n\n\u003cli\u003eImproves exhaust pressure-to-boost pressure ratios\u003c\/li\u003e\n\n\u003cli\u003eConstructed from High Silicon Molybdenum Ductile Iron (HSMD)\u003c\/li\u003e\n\n\u003cli\u003eDesigned to resist cracking, warping, and heat erosion\u003c\/li\u003e\n\n\u003cli\u003eAvailable in Polished Ceramic or Black Ceramic coatings\u003c\/li\u003e\n\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\n\u003cli\u003e2-Year Unlimited Mileage Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e PDI Performance Diesel\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e Big Boss™\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 101000074432\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Cummins ISX15 \/ X15 Engines\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eEngine Years:\u003c\/strong\u003e 2010–2024\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e HSMD (High Silicon Molybdenum Ductile Iron)\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eFinish Options:\u003c\/strong\u003e Polished Ceramic or Black Ceramic\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 2 Year Unlimited Mileage Warranty\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eMade In:\u003c\/strong\u003e USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\n\u003cp\u003e\nCompatible with Cummins ISX15 and X15 powered trucks including Peterbilt, Kenworth, Freightliner, Western Star, Volvo, and International applications from 2010 through 2024. :contentReference[oaicite:1]{index=1}\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eCross Reference\u003c\/h3\u003e\n\n\u003cp\u003e\nThis PDI Big Boss Exhaust Manifold replaces multiple OEM Cummins manifold assemblies:\n\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCummins:\u003c\/strong\u003e 3687063\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eCummins:\u003c\/strong\u003e 3692604\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eCummins:\u003c\/strong\u003e 3689251\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eCummins:\u003c\/strong\u003e 3687062\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003ePDI:\u003c\/strong\u003e 101000074432\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003ePerformance Benefits\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eUp to 20% greater airflow than stock\u003c\/li\u003e\n\n\u003cli\u003e75–100°F cooler exhaust temperatures\u003c\/li\u003e\n\n\u003cli\u003eImproved turbocharger efficiency\u003c\/li\u003e\n\n\u003cli\u003eReduced turbo lag\u003c\/li\u003e\n\n\u003cli\u003eImproved throttle response\u003c\/li\u003e\n\n\u003cli\u003ePotential fuel economy improvements\u003c\/li\u003e\n\n\u003cli\u003eMore balanced exhaust flow to the turbocharger\u003c\/li\u003e\n\n\u003cli\u003eImproved long-haul reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhy Upgrade Your Exhaust Manifold?\u003c\/h3\u003e\n\n\u003cp\u003e\nFactory ISX and X15 manifolds are known for heat-related fatigue, cracking, warped mounting surfaces, and exhaust leaks over time. The PDI Big Boss manifold addresses these common issues through improved material selection and redesigned airflow characteristics. The result is improved durability and better engine efficiency under heavy loads. :contentReference[oaicite:2]{index=2}\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cdiv style=\"background:#f8f8f8;padding:25px;border-left:4px solid #ff6a00;margin:25px 0;\"\u003e\n\u003ch3\u003e🔥 Increase Power \u0026amp; Reduce Turbo Lag\u003c\/h3\u003e\n\n\u003cp\u003e\nThe PDI Big Boss Exhaust Manifold is engineered to improve exhaust flow before it reaches the turbocharger. Balanced runner design and increased airflow help the turbo spool faster while reducing excessive exhaust backpressure.\n\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e✔ Up to 20% airflow increase\u003c\/li\u003e\n\u003cli\u003e✔ Reduced turbo lag\u003c\/li\u003e\n\u003cli\u003e✔ Cooler EGTs\u003c\/li\u003e\n\u003cli\u003e✔ Improved boost response\u003c\/li\u003e\n\u003cli\u003e✔ Increased durability over stock manifolds\u003c\/li\u003e\n\u003cli\u003e✔ Made in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\nTrusted by owner-operators, diesel performance enthusiasts, and fleets across North America.\n\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhy Choose PDI?\u003c\/h3\u003e\n\n\u003cp\u003e\nPDI has become one of the most respected names in heavy-duty diesel performance. Their Big Boss product line is engineered specifically for commercial trucking applications, delivering measurable improvements in airflow, efficiency, reliability, and performance. :contentReference[oaicite:3]{index=3}\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eFitment Notice\u003c\/h3\u003e\n\n\u003cp\u003e\nVerify engine serial number and OEM part numbers before ordering. Contact us with your ESN for fitment verification.\n\u003c\/p\u003e","brand":"PDI | Performance Diesel Inc.","offers":[{"title":"Default Title","offer_id":66832479191085,"sku":null,"price":1985.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/4526\/0845\/files\/DSC_4836.jpg?v=1780757024","url":"https:\/\/performancedieselgroup.com\/products\/pdi-big-boss-exhaust-manifold-cummins-isx15-x15","provider":"Performance Diesel Group","version":"1.0","type":"link"}