{"product_id":"kia-k4-gt-line-axle-back-exhaust-system","title":"2025+ Kia K4 GT-Line Axle Back Exhaust System | Sedan \u0026 Hatch | 1.6T \u0026 2.0 | 304 Stainless Steel","description":"\u003ch1 data-section-id=\"ul7a1e\" data-start=\"340\" data-end=\"381\"\u003eKia K4 GT-Line Axle Back Exhaust System\u003c\/h1\u003e\n\u003cp data-start=\"383\" data-end=\"727\"\u003eUnlock a deeper, sportier tone for your 2025+ Kia K4 GT-Line with the AeroFlow Dynamics axle back exhaust system. Designed for direct fitment on \u003cstrong data-start=\"528\" data-end=\"569\"\u003eKia K4 GT-Line sedan and hatch models\u003c\/strong\u003e, this system gives your K4 a cleaner rear end presence, improved sound, and a more aggressive driving experience without replacing the entire exhaust system.\u003c\/p\u003e\n\u003cp data-start=\"729\" data-end=\"1130\"\u003eBuilt from high quality \u003cstrong data-start=\"753\" data-end=\"779\"\u003eSS 304 stainless steel\u003c\/strong\u003e, this axle back system is made for long term durability, clean exhaust flow, and a premium motorsport inspired finish. Whether you drive the \u003cstrong data-start=\"921\" data-end=\"945\"\u003eK4 sedan or K4 hatch\u003c\/strong\u003e, and whether your vehicle is equipped with the \u003cstrong data-start=\"993\" data-end=\"1022\"\u003e1.6L turbo or 2.0L engine\u003c\/strong\u003e, this setup is the perfect upgrade for owners who want better sound, sharper styling, and OEM plus fitment.\u003c\/p\u003e\n\u003ch2 data-section-id=\"1iptetf\" data-start=\"1132\" data-end=\"1155\"\u003ePlatform Engineering\u003c\/h2\u003e\n\u003cp data-start=\"1157\" data-end=\"1460\"\u003eThe AFD Kia K4 GT-Line axle back exhaust system is designed to fit the \u003cstrong data-start=\"1228\" data-end=\"1261\"\u003e2025+ Kia K4 GT-Line platform\u003c\/strong\u003e, including both sedan and hatch body styles. Every section is built around the factory mounting points to help maintain proper alignment, clean fitment, and a direct bolt on installation experience.\u003c\/p\u003e\n\u003cp data-start=\"1462\" data-end=\"1626\"\u003eThis is not a universal muffler setup. It is engineered specifically for the Kia K4 GT-Line platform to deliver the right balance of tone, fitment, and drivability.\u003c\/p\u003e\n\u003ch2 data-section-id=\"h345jg\" data-start=\"1628\" data-end=\"1663\"\u003e304 Stainless Steel Construction\u003c\/h2\u003e\n\u003cp data-start=\"1665\" data-end=\"1949\"\u003eMade from \u003cstrong data-start=\"1675\" data-end=\"1701\"\u003eSS 304 stainless steel\u003c\/strong\u003e, this system is built to handle heat, moisture, and daily driving conditions better than lower grade exhaust materials. SS 304 is commonly used in premium performance exhaust systems because of its strength, corrosion resistance, and clean finish.\u003c\/p\u003e\n\u003ch2 data-section-id=\"mtwnil\" data-start=\"1951\" data-end=\"1967\"\u003eSound Profile\u003c\/h2\u003e\n\u003cp data-start=\"1969\" data-end=\"2201\"\u003eThe AFD Kia K4 GT-Line axle back exhaust gives the car a deeper and more aggressive tone compared to stock. It adds more presence during startup, acceleration, and spirited driving while keeping the car refined enough for daily use.\u003c\/p\u003e\n\u003ch3 data-section-id=\"bgde17\" data-start=\"2203\" data-end=\"2228\"\u003eSound Characteristics\u003c\/h3\u003e\n\u003cp data-start=\"2230\" data-end=\"2262\"\u003eDeeper exhaust tone over factory\u003c\/p\u003e\n\u003cp data-start=\"2264\" data-end=\"2286\"\u003eSportier sound profile\u003c\/p\u003e\n\u003cp data-start=\"2288\" data-end=\"2319\"\u003eCleaner rear section appearance\u003c\/p\u003e\n\u003cp data-start=\"2321\" data-end=\"2366\"\u003eMore aggressive startup and acceleration note\u003c\/p\u003e\n\u003cp data-start=\"2368\" data-end=\"2417\"\u003eDesigned for daily street driving and weekend fun\u003c\/p\u003e\n\u003ch2 data-section-id=\"1ma7m6t\" data-start=\"2419\" data-end=\"2434\"\u003eKey Features\u003c\/h2\u003e\n\u003cp data-start=\"2436\" data-end=\"2739\"\u003e✅ Fits 2025+ Kia K4 GT-Line models\u003cbr data-start=\"2470\" data-end=\"2473\"\u003e✅ Fits sedan and hatch\u003cbr data-start=\"2495\" data-end=\"2498\"\u003e✅ Fits 1.6L turbo and 2.0L models\u003cbr data-start=\"2531\" data-end=\"2534\"\u003e✅ Direct bolt on installation\u003cbr data-start=\"2563\" data-end=\"2566\"\u003e✅ Made from SS 304 stainless steel\u003cbr data-start=\"2600\" data-end=\"2603\"\u003e✅ Axle back exhaust design\u003cbr data-start=\"2629\" data-end=\"2632\"\u003e✅ Improved sound over stock\u003cbr data-start=\"2659\" data-end=\"2662\"\u003e✅ Clean OEM plus fitment\u003cbr data-start=\"2686\" data-end=\"2689\"\u003e✅ Built for durability and long term performance\u003c\/p\u003e\n\u003ch2 data-section-id=\"1dixaz0\" data-start=\"2741\" data-end=\"2751\"\u003eFitment\u003c\/h2\u003e\n\u003cp data-start=\"2753\" data-end=\"2790\"\u003e2025+ Kia K4 GT-Line Sedan 1.6L Turbo\u003c\/p\u003e\n\u003cp data-start=\"2792\" data-end=\"2829\"\u003e2025+ Kia K4 GT-Line Hatch 1.6L Turbo\u003c\/p\u003e\n\u003cp data-start=\"2831\" data-end=\"2862\"\u003e2025+ Kia K4 GT-Line Sedan 2.0L\u003c\/p\u003e\n\u003cp data-start=\"2864\" data-end=\"2895\"\u003e2025+ Kia K4 GT-Line Hatch 2.0L\u003c\/p\u003e\n\u003cp data-start=\"2897\" data-end=\"2985\"\u003eFits all 2025+ Kia K4 GT-Line sedan and hatch models with the 1.6L turbo or 2.0L engine.\u003c\/p\u003e\n\u003ch2 data-section-id=\"igcizn\" data-start=\"2987\" data-end=\"3006\"\u003eInstall Friendly\u003c\/h2\u003e\n\u003cp data-start=\"3008\" data-end=\"3166\"\u003eThe AFD axle back exhaust system is designed as a direct bolt on upgrade. No major modification is required when installed on the correct vehicle application.\u003c\/p\u003e\n\u003cp data-start=\"3168\" data-end=\"3268\"\u003eProfessional installation is always recommended for best alignment, clearance, and final adjustment.\u003c\/p\u003e\n\u003ch2 data-section-id=\"upsx6k\" data-start=\"3270\" data-end=\"3282\"\u003eLead Time\u003c\/h2\u003e\n\u003cp data-start=\"3284\" data-end=\"3311\"\u003ePRE-ORDER SHIPS AUGUST 2026\u003c\/p\u003e\n\u003ch2 data-section-id=\"up68vr\" data-start=\"3313\" data-end=\"3356\"\u003eWhy Upgrade Your Kia K4 GT-Line Exhaust?\u003c\/h2\u003e\n\u003cp data-start=\"3358\" data-end=\"3581\"\u003eThe factory exhaust on the Kia K4 GT-Line is designed to be quiet and conservative. The AFD axle back system gives your K4 the sound and attitude it should have from the factory while maintaining a clean, direct fit design.\u003c\/p\u003e\n\u003cp data-start=\"3583\" data-end=\"3753\"\u003eThis is the perfect first performance upgrade for K4 owners who want more sound, better appearance, and a more engaging drive without replacing the entire exhaust system.\u003c\/p\u003e","brand":"KIA Motors","offers":[{"title":"Default Title","offer_id":51719677837528,"sku":"K5-AXB-EX","price":449.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0872\/6382\/files\/Photoroom_20260516_210337.png?v=1779841619","url":"https:\/\/www.aeroflowdynamics.com\/products\/kia-k4-gt-line-axle-back-exhaust-system","provider":"AeroflowDynamics","version":"1.0","type":"link"}