{"product_id":"hks-header-back-exhaust-system-2013-fr-s-brz-86-8jh2rf","title":"HKS Header Back Exhaust System - 2013+ FR-S \/ BRZ \/ 86","description":"\u003ch4\u003e\u003cstrong\u003eHeader Back Exhaust System for the 2013+ FR-S, BRZ, and 86\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/4122\/0668\/products\/55e6c979ca9c1bb4b7213ad7bb998e1a_3281942a-92c8-43cc-90bb-7f5b2e0e60fa.jpg?v=1697650643\" alt=\"HKS Header Back Exhaust System - 2013+ FR-S \/ BRZ \/ 86\" style=\"float: right; width: 40%; max-width: 300px; height: auto; margin: 0 0 16px 20px;\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe HKS Header Back Exhaust System for the 2013+ Scion FR-S, Subaru BRZ, and Toyota 86 is a complete exhaust replacement from the header flange back, covering the full exhaust path between the header and the tailpipe. The header-back designation means this system replaces everything. The front pipe, the catalytic converter section, the midpipe, and the muffler, as a matched, engineered unit. This is the appropriate choice for builds that are also upgrading the headers, ensuring the complete exhaust path is optimized rather than mixing factory and aftermarket sections.\u003c\/p\u003e\n\u003cdiv style=\"clear: both;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch4\u003e\u003cstrong\u003eSpecs \u0026amp; Highlights\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eHeader-back exhaust system\u003c\/li\u003e\n\u003cli\u003eReplaces complete exhaust path from header flange to tailpipe\u003c\/li\u003e\n\u003cli\u003eMatched engineering throughout: no mixing factory and aftermarket sections\u003c\/li\u003e\n\u003cli\u003eOptimized for use with aftermarket equal length headers\u003c\/li\u003e\n\u003cli\u003eStainless steel construction\u003c\/li\u003e\n\u003cli\u003eFitment: 2013+ Scion FR-S \/ Subaru BRZ \/ Toyota 86\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003e\u003cstrong\u003e50.8mm Throughout, Mandrel-Bent Stainless Front Pipe\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThe header-back system uses 50.8mm (2 inch) diameter main pipe, the same as the SPEC-L2 cat-back, ensuring consistent flow area throughout the system when combined with the HKS equal length headers. The front pipe section is mandrel-bent stainless steel with a flex joint section to accommodate engine movement without creating a rigid joint at the header flange connection. Total system weight from header flange to tip is approximately 11.5 kg, versus approximately 15 kg for the complete factory exhaust from header flange back.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/4122\/0668\/products\/7f98a1e2969d560c78178af5b69b30d7_aaf01dfa-9627-431a-ac3f-4050a13148f1.jpg?v=1697650643\" alt=\"HKS Header Back Exhaust System - 2013+ FR-S \/ BRZ \/ 86\" style=\"max-width: 100%; height: auto; display: block; margin: 20px 0;\"\u003e \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/4122\/0668\/products\/d54be4bd2de909f7f391c46d37eb8570_21b737b7-a722-4494-8b50-bfb89a42cfc5.jpg?v=1697650643\" alt=\"HKS Header Back Exhaust System - 2013+ FR-S \/ BRZ \/ 86\" style=\"float: left; width: 40%; max-width: 300px; height: auto; margin: 0 20px 16px 0;\"\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eWhy the Header-Back Scope Matters for Paired Builds\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eA header-back system is the correct approach when you are already upgrading the headers. Running an aftermarket header into a stock cat and midpipe means you have an optimized flow area going into a restricted one. The improvement from the header is partially lost at the factory restriction downstream. The HKS header-back system ensures the flow path is consistent and engineered as a complete unit.\u003c\/p\u003e\n\u003cdiv style=\"clear: both;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0743\/4122\/0668\/products\/b24b173baaf10e4869788562a8265466_b2b887e4-f266-4139-b8cc-bf23aa2efddc.png?v=1697650643\" alt=\"HKS Header Back Exhaust System - 2013+ FR-S \/ BRZ \/ 86\" style=\"max-width: 100%; height: auto; display: block; margin: 20px 0;\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eComplete the System: Pair with Equal Length Headers\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThe HKS33005-AT006 Equal Length Catted Header pairs naturally with this system for a complete header-back build. Together they constitute the full front-to-rear exhaust upgrade for the FA20 platform in HKS's parts catalog.\u003c\/p\u003e\n\u003cdiv style=\"clear: both;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch4\u003e\u003cstrong\u003eThe FT Breakdown\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThe header-back exhaust is the complete exhaust solution for performance FA20 builds. It is more involved than a cat-back swap but the results reflect the more complete scope of the upgrade. If you are running equal length headers, a cat-back exhaust is leaving performance on the table by keeping the factory front pipe and cat. Pairing the header-back system with the HKS equal length headers (AT006) and the 50.8mm pipe throughout creates an exhaust system with consistent bore size from primary collector to tip — no flow transitions, no mismatched flanges. That complete-system consistency is what the best FA20 exhaust builds look like, and HKS designed the AT001 to complete that picture.\u003c\/p\u003e\n\u003cdiv style=\"clear: both;\"\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"HKS","offers":[{"title":"Default Title","offer_id":52621264945432,"sku":"HKS32025-AT001","price":1093.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0998\/4514\/4856\/files\/c4gvr1s83o9y_ffa46f2f-7641-4c76-bb66-92d7360d1cb5.jpg?v=1788747641","url":"https:\/\/driveforges.com\/products\/hks-header-back-exhaust-system-2013-fr-s-brz-86-8jh2rf","provider":"Drive Forge","version":"1.0","type":"link"}