{"product_id":"premium-ss304-catback-exhaust-system-for-porsche-991-1-991-2-gt3-4-0l-na-vacuum-valved-performance-exhaust","title":"Premium SS304 Catback Exhaust System for Porsche 911 991.1 991.2 GT3 4.0L NA Vacuum Valved Performance Exhaust","description":"\u003cdiv\u003e\n\u003ch3\u003eDESCRIPTION\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eOptimize Exhaust Flow \u0026amp; Deliver Pure High-Rev Flat Six Sport Sound for Porsche 991 GT3.\u003c\/strong\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\nThis mirror polished 304 stainless steel vacuum valved rear exhaust muffler set adopts thick mandrel bent stainless steel with bright mirror polished finish, upgrading chassis racing texture while maintaining stable high-temperature performance. Optimized balanced internal pipeline smooths exhaust gas circulation and reduces flow resistance, bringing sharper throttle feedback and richer penetrating high-rev flat-six vocal texture. Equipped with vacuum valve control system to support dual sound modes for different driving scenarios, switching between quiet daily cruising tone and aggressive resonant track exhaust note. Fitted with glossy black straight dual tail tips to upgrade rear sport visual effect. Precision real-car scanned chassis molding matches factory mounting positions completely, supporting direct OEM bolt-on installation without cutting or modification. Multi-stage pre-shipment quality inspection ensures consistent welding and polishing finish.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3\u003eVEHICLE FITMENT\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePorsche 911 991.1 GT3 \u003c\/strong\u003e— All Production Years (4.0L Naturally Aspirated Flat Six Engine)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePorsche 911 991.2 GT3 \u003c\/strong\u003e— All Production Years (4.0L Naturally Aspirated Flat Six Engine)\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThick Mandrel Bent Premium SS304 Stainless Steel Base:\u003c\/strong\u003e Heavy-duty pipe wall with excellent anti-rust and heat resistance, long service life under sustained extreme high heat operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMirror Polished Bright Metal Surface:\u003c\/strong\u003e Smooth reflective polished layer delivers clean premium racing appearance and easy daily cleaning maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVacuum Valve Control System:\u003c\/strong\u003e One-click switch between comfortable quiet street mode and vibrant high-rev naturally aspirated flat-six race sound.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced Optimized Internal Pipeline Layout:\u003c\/strong\u003e Evenly distributes bilateral exhaust pulses to cut gas circulation resistance and fully release original engine sound characteristics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGloss Black Straight Dual Tail Tips:\u003c\/strong\u003e Uniform matte black metal finish, neat two-outlet layout perfectly matches 991 GT3 rear bumper contour.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Hand Fish-Scale TIG Air-Tight Welding:\u003c\/strong\u003e Uniform smooth welds keep airtight under long-term limit exhaust heat, no abnormal rattling or gas leakage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision OEM Direct Plug \u0026amp; Play Design:\u003c\/strong\u003e 1:1 real-car scanned pipeline routing avoids chassis interference, seamless bolt-on replacement without extra modification.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3\u003eTECH SPECIFICATIONS\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain Pipe Material:\u003c\/strong\u003e Thick Mandrel Bent SS304 Stainless Steel with Mirror Polished Finish\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Accessory:\u003c\/strong\u003e Detachable Gloss Black Straight Dual Tail Sleeves\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Type:\u003c\/strong\u003e Vacuum Driven Electronic Valve Control System\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Balanced Muffler Catback Exhaust Pair\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWelding Process:\u003c\/strong\u003e Handcrafted Full Fish-Scale TIG Seamless Air-Tight Welding\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Engine:\u003c\/strong\u003e 4.0L Naturally Aspirated Flat Six (991.1 \/ 991.2 GT3)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch3\u003eWHAT'S IN THE BOX\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003e1 Pair Complete Mirror Polished SS304 Vacuum Valved Catback Muffler Assembly\u003c\/li\u003e\n\u003cli\u003e2x Gloss Black Straight Exhaust Tip Sleeves\u003c\/li\u003e\n\u003cli\u003eVacuum Valve Control Harness \u0026amp; Control Module + Wireless Remote Fobs\u003c\/li\u003e\n\u003cli\u003eFull Set OEM Matching Installation Clamps \u0026amp; Hardware Kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Wanmax Racing","offers":[{"title":"Default Title","offer_id":54968926929268,"sku":null,"price":650.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0990\/7244\/2740\/files\/ExhaustSystemforPorsche991GT3_1_1.jpg?v=1784187289","url":"https:\/\/wanmaxracing.com\/products\/premium-ss304-catback-exhaust-system-for-porsche-991-1-991-2-gt3-4-0l-na-vacuum-valved-performance-exhaust","provider":"Wanmax Racing","version":"1.0","type":"link"}