{"product_id":"b9rs4-dp-redstar-audi-b9-rs5-rs4-downpipes","title":"Redstar Audi B9 RS5\/RS4 Downpipes","description":"\u003cp class=\"redstar-intro\"\u003eTransform your Audi RS5 F5 or RS4 8W B9\/B9.5 2.9 TFSI with Redstar performance exhaust downpipes engineered for the Porsche 2.9L application. Purpose-built for these platforms, the system focuses on flow efficiency and precision fitment to elevate everyday drivability and track-ready response.\u003c\/p\u003e\n\u003cp class=\"redstar-intro\"\u003eA big bore layout with smooth transitions maximises gas velocity, using long cones to taper the OEM 127mm turbo outlet flanges to an 89mm main section before a second, controlled transition to 76mm. This geometry helps reduce backpressure, sharpen throttle response and improve spool characteristics, delivering meaningful power gains and a richer, more engaging exhaust note.\u003c\/p\u003e\n\u003cp class=\"redstar-intro\"\u003eManufactured from premium materials and finished to a high standard, each Redstar downpipe integrates with OEM mounting points for a true bolt-on experience and is compliant for both LHD and RHD vehicles. Optional OEM-style heat shielding reduces radiant heat by up to 80% to help protect surrounding components. Designed, built and welded to Redstar’s exacting standards, this is a robust performance upgrade that enhances the character and capability of your Audi RS5 or RS4.\u003c\/p\u003e\n\n\u003ch2 class=\"redstar-section-title\"\u003eAvailable Options\u003c\/h2\u003e\n\u003cul class=\"redstar-options\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGESI GEN2 400cpsi Catalytic Converters:\u003c\/strong\u003e The latest GEN2 series from GESI is rated to support up to 1000hp while offering smoother exhaust flow and improved efficiency compared with factory units. Featuring advanced emissions technology for optimal catalyst function at high flow rates. A strong choice for those seeking significant performance gains with refined operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOEM-Style Heat Shielding:\u003c\/strong\u003e Redstar's signature thermal management system reduces radiant exhaust heat by up to 80%. Developed with motorsport-inspired materials and construction, it uses a multi-layer design of ceramic insulation and embossed stainless steel foil. Unlike wraps or coatings that degrade quickly, Redstar shielding delivers long-term durability and consistent protection for engine bay components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 class=\"redstar-section-title\"\u003eKey Performance Benefits\u003c\/h2\u003e\n\u003cul class=\"redstar-benefits\"\u003e\n  \u003cli\u003eNoticeable power and torque gains from reduced backpressure\u003c\/li\u003e\n  \u003cli\u003eFaster turbo spool with crisper throttle response\u003c\/li\u003e\n  \u003cli\u003eLower under-bonnet temperatures that help protect nearby components\u003c\/li\u003e\n  \u003cli\u003eEnhanced exhaust tone for a more engaging sound\u003c\/li\u003e\n  \u003cli\u003eBolt-on installation using factory mounting locations\u003c\/li\u003e\n  \u003cli\u003eHelps promote longer turbocharger service life\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 class=\"redstar-section-title\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul class=\"redstar-specifications\"\u003e\n  \u003cli\u003eBig bore design with smooth transition geometry for efficient flow\u003c\/li\u003e\n  \u003cli\u003eLong cones reduce OEM 127mm turbo flanges to 89mm main diameter, with a second transition to 76mm\u003c\/li\u003e\n  \u003cli\u003e2.0mm wall 304L stainless steel construction\u003c\/li\u003e\n  \u003cli\u003e100% TIG welded and back purged\u003c\/li\u003e\n  \u003cli\u003eOEM-spec V-band flanges\u003c\/li\u003e\n  \u003cli\u003eAll brackets and mounts mirror the OEM layout\u003c\/li\u003e\n  \u003cli\u003eLHD\/RHD compliant\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eManufacturer fitment\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n  \u003cli\u003e2018+ Audi RS4 8W B9\/B9.5 2.9 TFSI\u003c\/li\u003e\n  \u003cli\u003e2018+ Audi RS5 F5 2.9 TFSI\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFits\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAudi A4 (B9) Wagon RS 4 2018-2024\u003cbr\u003eAudi A5 (F5) Coupe RS 5 2017-2024\u003cbr\u003eAudi A5 (F5) Sportback RS 5 2018-2024\u003c\/p\u003e\u003cp\u003e\u003cem\u003eProfessional fitting is recommended.\u003c\/em\u003e\u003c\/p\u003e","brand":"Redstar Exhaust","offers":[{"title":"HJS HD 200cpsi 130mm \/ Heat Shielded","offer_id":46873066766415,"sku":"B9RS4-DP130-HS","price":8909.0,"currency_code":"AUD","in_stock":true},{"title":"HJS HD 200cpsi 143mm \/ Heat Shielded","offer_id":46873066799183,"sku":"B9RS4-DP143-HS","price":10049.0,"currency_code":"AUD","in_stock":true},{"title":"GESI GEN2 UHO+ 400cpsi 5\" \/ Heat Shielded","offer_id":46873066831951,"sku":"B9RS4-DP50-HS","price":7759.0,"currency_code":"AUD","in_stock":true},{"title":"HJS HD 200cpsi 130mm \/ No Heat Shielding","offer_id":46873066864719,"sku":"B9RS4-DP130","price":8079.0,"currency_code":"AUD","in_stock":true},{"title":"HJS HD 200cpsi 143mm \/ No Heat Shielding","offer_id":46873066897487,"sku":"B9RS4-DP143","price":9219.0,"currency_code":"AUD","in_stock":true},{"title":"GESI GEN2 UHO+ 400cpsi 5\" \/ No Heat Shielding","offer_id":46873066930255,"sku":"B9RS4-DP50","price":6939.0,"currency_code":"AUD","in_stock":true},{"title":"Competition (catless) \/ Heat Shielded","offer_id":46873066963023,"sku":"B9RS4-DPCL-HS","price":3539.0,"currency_code":"AUD","in_stock":true},{"title":"Competition (catless) \/ No Heat Shielding","offer_id":46873066995791,"sku":"B9RS4-DPCL","price":2709.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0660\/4383\/8543\/files\/B9RS4-DP.jpg?v=1790044409","url":"https:\/\/heasmansaus.myshopify.com\/products\/b9rs4-dp-redstar-audi-b9-rs5-rs4-downpipes","provider":"heasmansaus","version":"1.0","type":"link"}