{"product_id":"active-autowerke-g90-signature-catback-exhaust-system","title":"Active Autowerke G90 Signature Catback Exhaust System","description":"\u003ch3 class=\"MsoNormal\"\u003e\u003cstrong\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eG90 Signature Catback Exhaust System\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eStainless Steel Valved Full Exhaust System – BMW G90 M5 (S68 Twin-Turbo V8-Hybrid)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eTransform the performance and sound of your 2025+ BMW G90 M5 with our premium T304 stainless steel valved full exhaust system. Purpose-built for the S68 4.4L twin-turbo V8, this system is engineered to enhance exhaust flow, reduce backpressure, and deliver a deep, aggressive tone—without compromising daily drivability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eDesigned using advanced techniques for a precise OEM-fit, this exhaust system integrates seamlessly with all factory mounting points and adds exhaust valve control which is missing from the OEM exhaust system. Whether cruising or pushing the limits, this system provides an immersive and exhilarating exhaust experience.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eKey Highlights:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eT304 Stainless Steel Construction: \u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eBuilt entirely from corrosion-resistant, mandrel-bent T304 stainless steel, this system offers long-term durability, heat resistance, and a consistent finish. Welded with precision using TIG methods to ensure structural integrity and leak-free performance under high-load conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eRemote control Exhaust Valves: Adds an el\u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eectronic valve system controlled by a remote to replace the missing exhaust valves BMW did not provide with the stock exhaust. Provides a quiet, subdued tone in comfort modes and an aggressive, open-valve growl in dynamic settings—no tuning or coding required.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eHigh-Flow X-Pipe Midsection: \u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eCentralized X-pipe balances exhaust pulses between banks, improving scavenging and enhancing the natural V8 rhythm. Reduces unwanted drone and enhances top-end acoustics under throttle.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003ePerformance-Oriented Flow Path: Oversized and optimized\u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e 3.5” (89mm) piping diameter ensures efficient flow, minimizes turbulence, and maximizes power delivery throughout the rev range. Estimated gains of +18–22 hp and +20–25 lb-ft torque (with optional EPA catted downpipes).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eOptional High-Flow Catted Downpipes: \u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eAvailable as an upgrade, our 400-cell GESI catalytic converters maintain emissions compliance (region-dependent) while increasing turbo efficiency and reducing spool time. CNC-machined flanges and heat shielding ensure fitment and thermal control.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eSound Engineering: \u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003ePrecision-tuned for a refined cold start, deep idle rumble, and aggressive throttle response. The system delivers a clean, motorsport-inspired tone without unwanted cabin drone—ideal for both spirited driving and long highway trips.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eQuad 112mm Exhaust Tips (Multiple Finishes): \u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eChoose from brushed stainless, matte black  or carbon fiber quad tips to match your M5’s styling. Dual-wall design resists heat discoloration and adds a premium finish to the rear profile.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eDirect Bolt-On Installation: \u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eNo cutting, welding, or modification required. Includes all clamps, gaskets, valve motor brackets, valve motors with remotes and hardware. Fully reversible for lease or resale.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eSpecifications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan class=\"apple-tab-span\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e\u003cspan style=\"mso-tab-count: 1;\"\u003e                \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e•\u003cspan class=\"apple-tab-span\"\u003e\u003cspan style=\"mso-tab-count: 1;\"\u003e \u003c\/span\u003e\u003c\/span\u003eMaterial: T304 Stainless Steel\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan class=\"apple-tab-span\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e\u003cspan style=\"mso-tab-count: 1;\"\u003e                \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e•\u003cspan class=\"apple-tab-span\"\u003e\u003cspan style=\"mso-tab-count: 1;\"\u003e \u003c\/span\u003e\u003c\/span\u003eTubing Diameter: 3.5” (89mm) from downpipes to rear exhaust\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan class=\"apple-tab-span\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e\u003cspan style=\"mso-tab-count: 1;\"\u003e                \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e•\u003cspan class=\"apple-tab-span\"\u003e\u003cspan style=\"mso-tab-count: 1;\"\u003e \u003c\/span\u003e\u003c\/span\u003eValves: Electronic remote control plug-and-play\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan class=\"apple-tab-span\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e\u003cspan style=\"mso-tab-count: 1;\"\u003e                \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e•\u003cspan class=\"apple-tab-span\"\u003e\u003cspan style=\"mso-tab-count: 1;\"\u003e W\u003c\/span\u003e\u003c\/span\u003eeight Reduction: ~10–12 lbs vs. OEM system\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan class=\"apple-tab-span\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e\u003cspan style=\"mso-tab-count: 1;\"\u003e                \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e•\u003cspan class=\"apple-tab-span\"\u003e\u003cspan style=\"mso-tab-count: 1;\"\u003e \u003c\/span\u003e\u003c\/span\u003eTip Diameter: 112mm (quad outlet)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan class=\"apple-tab-span\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e\u003cspan style=\"mso-tab-count: 1;\"\u003e                \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003e•\u003cspan class=\"apple-tab-span\"\u003e\u003cspan style=\"mso-tab-count: 1;\"\u003e \u003c\/span\u003e\u003c\/span\u003eFitment: BMW G90 M5 (2025+) \/ G99 M5 Touring\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eWhy Choose This Exhaust System?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eThis full stainless system offers the perfect balance of durability, sound tuning, and performance gains—without sacrificing luxury or OEM integration. Ideal for enthusiasts looking for a visceral exhaust experience with the peace of mind of factory compatibility and high-quality materials.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"MsoNormal\"\u003e\u003cspan style=\"mso-fareast-font-family: 'Times New Roman';\"\u003eUnlock the full potential of your G90 M5. Let it breathe, let it roar.\u003c\/span\u003e\u003c\/h3\u003e","brand":"Active Autowerke","offers":[{"title":"Brushed Tips","offer_id":47306661494961,"sku":"11-141","price":4499.0,"currency_code":"USD","in_stock":true},{"title":"Matte Black Tips","offer_id":47306661527729,"sku":"11-141B","price":4599.0,"currency_code":"USD","in_stock":true},{"title":"Carbon Fiber Tips","offer_id":47306661560497,"sku":"11-141C","price":4999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0681\/1379\/3201\/files\/G90catbackreard.webp?v=1779397598","url":"https:\/\/hstuning.com\/products\/active-autowerke-g90-signature-catback-exhaust-system","provider":"HS Tuning ","version":"1.0","type":"link"}