{"product_id":"milltek-hi-flow-sports-cat-audi-b7-rs4-ssxau115","title":"Hi-Flow Sports Cat | Audi B7 RS4 | Milltek","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Milltek Cat Back Hi-Flow Sports Cat for Audi B7 RS4 is a direct-fitment downpipe-mounted catalytic converter engineered to optimize exhaust scavenging and flow. T304L stainless construction with 200 CPSI high-flow catalyst element maintains emissions compliance while reducing backpressure across the rev range.\u003c\/p\u003e\n\u003cp\u003eMandrel-bent 2.5\" (60mm) bore with CNC-formed catalyst housing. Hand-finished T304L stainless steel resists thermal cycling and corrosion. Designed to pair with Milltek Cat-Back systems on B7 RS4 (4.2L FSI V8). Requires Stage 2 ECU software for optimal mapping. Direct OEM hanger fitment—no modification required.\u003c\/p\u003e\n\u003ch2\u003eDetails\u003c\/h2\u003e\n\u003ch3\u003eFitment Notes \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi B7 RS4 Sedan and Avant (2006–2008)\u003c\/li\u003e\n\u003cli\u003eEngine: 4.2L FSI V8 (BNS)\u003c\/li\u003e\n\u003cli\u003eRequires: Milltek Cat-Back Exhaust System\u003c\/li\u003e\n\u003cli\u003eRequires: Stage 2 ECU Software tuning\u003c\/li\u003e\n\u003cli\u003eDirect factory fitment—uses OEM hangers and sensor bungs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e Dyno-tested for flow and thermal performance against OEM catalytic converters. \u003c\/p\u003e\n\u003cp\u003eDesigned and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.\u003c\/p\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":68005479481646,"sku":"SSXAU115","price":1653.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/1719\/1726\/files\/SSXAU115_1.jpg?v=1794451561","url":"https:\/\/shopicwp.com\/products\/milltek-hi-flow-sports-cat-audi-b7-rs4-ssxau115","provider":"Inner Circle Wheels and Performance","version":"1.0","type":"link"}