{"product_id":"porsche-rennsport-muffler-exhaust-system-911-2018-2019-fs-por-9912gt3-rsmc","title":"Porsche Rennsport Muffler Exhaust System - 911 | 2018-2019  FS-POR-9912GT3-RSMC","description":"\u003cp\u003ePorsche Rennsport Muffler For Porsche 991.2 GT3 (2018), 991.2 GT3 RS (2019) Models.\u003c\/p\u003e\n\u003cp data-sourcepos=\"1:1-1:396\"\u003eRennsport Muffler, the ultimate solution to the cracking, breaking, and blowout issues prevalent in OEM GT3 mufflers, especially the titanium versions found on GT3RS models. Fabspeed Motorsport Engineers have designed a primary muffler replacement that not only resolves these durability concerns but also significantly improves upon the OEM design in multiple measurable aspects.\u003c\/p\u003e\n\u003cp data-sourcepos=\"3:1-3:511\"\u003eDrawing on over 30 years of air-cooled and water-cooled Porsche expertise, we optimized the valve-open tubing diameter to 2.75 inches (70mm), the ideal size for GT3 engines to achieve low restriction while maintaining high velocity and the signature high-RPM GT3 CUP car sound. We then integrated our signature investment-cast 70mm (2.75\") X-pipe for optimal exhaust scavenging and maximum volumetric efficiency. This X-pipe merges the two cylinder banks without introducing any restriction to the exhaust flow.\u003c\/p\u003e\n\u003cp data-sourcepos=\"5:1-5:504\"\u003eTo preserve the desirable exhaust note and drone-free characteristics of the factory muffler, we meticulously replicated Porsche's 7-chamber design. This ensures a completely drone-free experience, even when paired with cat-less race headers. For the ultimate emissions-compliant lightweight GT3 exhaust, combine our Rennsport Muffler with GT3 headers featuring catalytic converters or Fabspeed headers with HJS German EPA-approved catalytic converters, along with Fabspeed GT3 Side Muffler Bypass Pipes.\u003c\/p\u003e\n\u003cp data-sourcepos=\"7:1-7:519\"\u003e\u003cstrong\u003ePOWER:\u003c\/strong\u003e\u003cbr\u003eOn our 991.1 GT3RS test vehicle, when paired with our Side Muffler Bypass Pipes, the Rennsport Muffler delivered an impressive gain of 27 lb-ft of torque down low at 3,200 RPM. Across the mid-range from 2,900 RPM to 5,700 RPM, it provided a consistent increase of 12 horsepower or more, with peak power at the wheels increasing from 446 to 454. This translates to a gain of over 12 horsepower at the crank – achieved simply by replacing the fragile and restrictive OEM Porsche muffler with the robust Rennsport Muffler.\u003c\/p\u003e\n\u003cp data-sourcepos=\"11:1-11:13\"\u003e\u003cstrong\u003eFEATURES:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-sourcepos=\"13:1-21:64\"\u003e\n\u003cli data-sourcepos=\"13:1-13:86\"\u003eConstructed from precision CNC-cut T304L stainless steel for exceptional durability.\u003c\/li\u003e\n\u003cli data-sourcepos=\"14:1-14:105\"\u003eDesigned using 3D scans of the OEM muffler to ensure perfect bolt-on fitment, simplifying installation.\u003c\/li\u003e\n\u003cli data-sourcepos=\"15:1-15:92\"\u003eEngineered to eliminate the cracking and breaking issues inherent in ALL OEM GT3 mufflers.\u003c\/li\u003e\n\u003cli data-sourcepos=\"16:1-16:117\"\u003eIncorporates our signature cast X-pipe, providing superior exhaust flow and scavenging compared to any other brand.\u003c\/li\u003e\n\u003cli data-sourcepos=\"17:1-17:136\"\u003eWhen paired with our Side Muffler Bypass Pipes, this muffler adds +27 lb-ft of torque and +16 WHP (approximately +18 HP at the crank).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp data-sourcepos=\"3:1-3:13\"\u003e\u003cstrong\u003eReturns subject to a 25% restocking fee.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Fabspeed","offers":[{"title":"Carbon Fiber","offer_id":40859096252474,"sku":"FS.POR.9912GT3.RSMC","price":4946.49,"currency_code":"USD","in_stock":true},{"title":"Satin Black","offer_id":40859096285242,"sku":"FS.POR.9912GT3.RSMB","price":4946.49,"currency_code":"USD","in_stock":true},{"title":"Polished Stainless Steel","offer_id":40859096318010,"sku":"FS.POR.9912GT3.RSMP","price":4946.49,"currency_code":"USD","in_stock":true},{"title":"Brushed Stainless Turn Down","offer_id":40859096350778,"sku":"FS.POR.9912GT3.RSMTD","price":4946.49,"currency_code":"USD","in_stock":true},{"title":"Titanium","offer_id":40859096383546,"sku":"FS.POR.9912GT3.RSMTI","price":4946.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0549\/4846\/2650\/files\/Porsche-Rennsport-Muffler-Exhaust-System-911-2018-0.jpg?v=1747924526","url":"https:\/\/sierramadrecollection.com\/products\/porsche-rennsport-muffler-exhaust-system-911-2018-2019-fs-por-9912gt3-rsmc","provider":"Sierra Madre Collection","version":"1.0","type":"link"}