{"product_id":"autobahn-autoworx-audi-b6-b7-s4-c5-allroad-4-2l-v8-cranckcase-breather","title":"Crankcase Breather Hose – Audi 4.2L V8 (B6 \/ B7 S4 \u0026 C5 Allroad)","description":"\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"832722f1-d1d7-422a-ac86-105312d41786\" dir=\"auto\" data-message-model-slug=\"gpt-5-3-mini\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003ch1 data-section-id=\"17izxig\" data-start=\"0\" data-end=\"66\"\u003eCrankcase Breather Hose – Audi 4.2L V8 (B6 \/ B7 S4 \u0026amp; C5 Allroad)\u003c\/h1\u003e\n\u003cp data-start=\"68\" data-end=\"130\"\u003e\u003cstrong data-start=\"68\" data-end=\"95\"\u003ePart Number: AUT-B6-003\u003c\/strong\u003e\u003cbr data-start=\"95\" data-end=\"98\"\u003e\u003cstrong data-start=\"98\" data-end=\"130\"\u003eOEM Reference: 079 103 221 C\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"132\" data-end=\"471\"\u003eReplace your cracked or failing factory crankcase breather hose with this \u003cstrong data-start=\"206\" data-end=\"251\"\u003ehigh-quality performance silicone upgrade\u003c\/strong\u003e, designed specifically for Audi 4.2L V8 applications. Built to withstand heat, oil vapor, and long-term engine bay stress, this hose helps restore proper crankcase ventilation and maintain consistent engine performance.\u003c\/p\u003e\n\u003cp data-start=\"473\" data-end=\"709\"\u003eA deteriorated breather hose can lead to vacuum leaks, rough idle, oil contamination issues, and reduced engine efficiency. This upgraded silicone replacement ensures a tighter, more durable seal compared to aging OEM rubber components.\u003c\/p\u003e\n\u003ch2 data-section-id=\"1d7mrtu\" data-start=\"711\" data-end=\"722\"\u003eFeatures\u003c\/h2\u003e\n\u003cul data-start=\"724\" data-end=\"1118\"\u003e\n\u003cli data-section-id=\"1gxqgzx\" data-start=\"724\" data-end=\"782\"\u003eDirect replacement for OEM part number \u003cstrong data-start=\"765\" data-end=\"782\"\u003e079 103 221 C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"cpybgn\" data-start=\"783\" data-end=\"829\"\u003eHeavy-duty performance silicone construction\u003c\/li\u003e\n\u003cli data-section-id=\"7eh8w2\" data-start=\"830\" data-end=\"889\"\u003eDesigned for high-heat crankcase ventilation applications\u003c\/li\u003e\n\u003cli data-section-id=\"rsi3nw\" data-start=\"890\" data-end=\"942\"\u003eResistant to oil vapor, heat cycling, and cracking\u003c\/li\u003e\n\u003cli data-section-id=\"1vsuscn\" data-start=\"943\" data-end=\"1001\"\u003eRestores proper crankcase breathing and vacuum stability\u003c\/li\u003e\n\u003cli data-section-id=\"ml8c2c\" data-start=\"1002\" data-end=\"1058\"\u003eImproves idle quality and long-term engine reliability\u003c\/li\u003e\n\u003cli data-section-id=\"1rgs6g5\" data-start=\"1059\" data-end=\"1118\"\u003eIdeal OEM replacement or preventative maintenance upgrade\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-section-id=\"1dixaz0\" data-start=\"1120\" data-end=\"1130\"\u003eFitment\u003c\/h2\u003e\n\u003cp data-start=\"1132\" data-end=\"1185\"\u003eCompatible with Audi 4.2L V8 applications, including:\u003c\/p\u003e\n\u003cul data-start=\"1187\" data-end=\"1284\"\u003e\n\u003cli data-section-id=\"1dp3eu2\" data-start=\"1187\" data-end=\"1217\"\u003e2004–2005 Audi S4 B6 4.2L V8\u003c\/li\u003e\n\u003cli data-section-id=\"14ik6lz\" data-start=\"1218\" data-end=\"1248\"\u003e2005–2008 Audi S4 B7 4.2L V8\u003c\/li\u003e\n\u003cli data-section-id=\"1kl28lf\" data-start=\"1249\" data-end=\"1284\"\u003e2001–2005 Audi Allroad C5 4.2L V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1286\" data-end=\"1344\"\u003e⚠️ Always confirm OEM part number fitment before ordering.\u003c\/p\u003e\n\u003ch2 data-section-id=\"16dprsq\" data-start=\"1346\" data-end=\"1367\"\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul data-start=\"1369\" data-end=\"1561\"\u003e\n\u003cli data-section-id=\"166oidj\" data-start=\"1369\" data-end=\"1404\"\u003eDirect replacement in OEM routing\u003c\/li\u003e\n\u003cli data-section-id=\"1ny9c43\" data-start=\"1405\" data-end=\"1492\"\u003eMinor trimming may be required depending on vehicle condition or intake modifications\u003c\/li\u003e\n\u003cli data-section-id=\"ucdc5k\" data-start=\"1493\" data-end=\"1561\"\u003eProfessional installation recommended for best sealing and fitment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-section-id=\"w3a6bn\" data-start=\"1563\" data-end=\"1581\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul data-start=\"1583\" data-end=\"1621\"\u003e\n\u003cli data-section-id=\"1491vdb\" data-start=\"1583\" data-end=\"1621\"\u003e(1) Silicone Crankcase Breather Hose\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-section-id=\"xwcpi\" data-start=\"1623\" data-end=\"1663\"\u003eBrand Information – Autobahn Autoworx\u003c\/h2\u003e\n\u003cp data-start=\"1665\" data-end=\"1968\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eAutobahn Autoworx hose kits are engineered for long-term durability and performance. All coolant hoses feature 3-ply construction, while boost, breather, ISV, and intake\/inlet hoses utilize reinforced 4-ply silicone for maximum strength and reliability in high-performance and daily-driven applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Autobahn Autoworx","offers":[{"title":"Default Title","offer_id":45459574980668,"sku":"Aut-b6-003","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/5934\/4956\/files\/IMG_2301.jpg?v=1780441323","url":"https:\/\/rpm-racing.com\/products\/autobahn-autoworx-audi-b6-b7-s4-c5-allroad-4-2l-v8-cranckcase-breather","provider":"Racing Precision Motorsports","version":"1.0","type":"link"}