{"product_id":"audi-a4-b8-rear-diffuser-s4-v1","title":"Audi A4 B8 Rear Diffuser — S4 V1","description":"\u003cp\u003e\u003cstrong\u003eFits the Audi A4 B8, 2008 onwards — standard rear bumper, twin exit each side.\u003c\/strong\u003e Not the A4 B9 — different bumper.\u003c\/p\u003e\n\u003cp\u003eThe rear valance on the Audi A4 B8 is flat, and from behind the car looks unfinished next to the rest of the range. This rear diffuser adds the cut-outs and the depth the standard bumper lacks: matte black out of the box, taped and screwed to the underside of the bumper, and nothing is cut.\u003c\/p\u003e\n\u003ch3\u003eAbout the rear diffuser\u003c\/h3\u003e\n\u003cp\u003eA one-piece rear diffuser in Blade Autostyling's S4 V1 design that sits in the lower centre of the rear bumper around the exhaust. It is vacuum-formed plastic, which keeps the part light and lets it flex over a knock rather than crack.\u003c\/p\u003e\n\u003cp\u003eIt arrives in black with the protective film still on, ready to go on the car. Once fitted the rear of the car has the depth and the shadow line it was missing.\u003c\/p\u003e\n\u003ch3\u003eWill it fit your Audi?\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudi A4 B8 — standard rear bumper\u003c\/td\u003e\n\u003ctd\u003e2008 onwards\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eA4 B9\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eNo — different moulding\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSpecification\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVacuum-formed plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGloss Black , ready to fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePieces\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFixing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAutomotive double-sided tape and screws into the underside of the bumper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFitting time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAbout an hour\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIn the box\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOne piece, protective film applied. Tape and screws are not included — use a good automotive double-sided tape such as 3M and 4mm self-tappers.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart no.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCW-23\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFitting it\u003c\/h3\u003e\n\u003cp\u003eClean the lower bumper with panel wipe. Dry fit the diffuser around the exhaust and check the cut-outs line up before the backing paper comes off. Warm both surfaces, press from the centre outwards, then add the screws into the plastic underside of the bumper. Leave it 24 hours before a jet wash.\u003c\/p\u003e\n\u003ch3\u003eDelivery, fitting and returns\u003c\/h3\u003e\n\u003cp\u003eDelivery is £20 to any UK or Ireland address, on every body kit part. Or have it fitted at Blade Performance in Portadown for an extra £20 — supplied and fitted the same day, and we warrant the fit. Check the diffuser against the car before the protective film comes off, and let us know about any transit damage within 48 hours of delivery.\u003c\/p\u003e\n\u003ch3\u003eWhat it won't do\u003c\/h3\u003e\n\u003cp\u003eThe exhaust layout has to match — check the cut-outs against your tips before ordering.\u003c\/p\u003e\n\u003cp\u003eIt does not change the exhaust note or the tips; it is a styling part.\u003c\/p\u003e\n\u003cp\u003eIt is not injection-moulded ABS. Vacuum-formed plastic is lighter and more forgiving on impact, but it is thinner, and it is not a structural part.\u003c\/p\u003e\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the Audi A4 B8 rear diffuser need painting?\u003c\/strong\u003e\u003cbr\u003eNo. It is supplied in matte black and goes straight on the car.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it need drilling?\u003c\/strong\u003e\u003cbr\u003eTape holds the alignment and screws into the plastic underside of the bumper hold it for good. Nothing goes into bodywork or paint.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit my exhaust?\u003c\/strong\u003e\u003cbr\u003eOnly the layout on the fitment line above. Check the cut-outs against your tips before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I collect it or have it fitted?\u003c\/strong\u003e\u003cbr\u003eYes. Collect from the shop in Portadown, or book it in and we fit it while you wait.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eComplete the kit:\u003c\/strong\u003e pair it with a \u003ca href=\"\/collections\/front-lips\"\u003efront splitter\u003c\/a\u003e and \u003ca href=\"\/collections\/side-skirts\"\u003eside skirts\u003c\/a\u003e for the full look.\u003c\/p\u003e\n\u003cp\u003eSee the rest of the \u003ca href=\"\/collections\/audi-a4-b8-body-kits\"\u003eAudi A4 B8 body kit range\u003c\/a\u003e.\u003c\/p\u003e","brand":"Blade Autostyling","offers":[{"title":"Default Title","offer_id":56300947702145,"sku":"CW-AN1031826-23","price":84.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0759\/2316\/1362\/files\/ChatGPT_Image_Sep_24_2026_04_07_19_PM.png?v=1790262452","url":"https:\/\/www.bladeperformance.shop\/products\/audi-a4-b8-rear-diffuser-s4-v1","provider":"Blade Performance ","version":"1.0","type":"link"}