{"product_id":"karbonius-carbon-fibre-airbox-csl-bmw-e46-m3-z4m","title":"Karbonius CSL Style Carbon Fibre Airbox\/Intake Plenum for BMW E46 M3 \u0026 Z4M (S54) - Autoclave Prepreg Carbon Build, Velocity Stacks, CSL Induction Sound","description":"\u003cdiv class=\"product-description\"\u003e\n  \u003ch2\u003eKarbonius CSL Style Carbon Fibre Airbox Intake Plenum for BMW E46 M3 and BMW Z4M S54\u003c\/h2\u003e\n  \n  \u003cp\u003e\n    Transform your BMW E46 M3 or BMW Z4M with the Karbonius CSL style carbon fibre airbox. This S54 carbon fibre intake plenum delivers the iconic CSL induction sound, sharper throttle response and genuine performance potential. If you are searching for BMW E46 M3 carbon fibre airbox, E46 M3 CSL airbox, CSL style airbox, S54 carbon intake, CSL plenum, E46 M3 induction kit or BMW Z4M carbon airbox, this autoclave prepreg carbon solution is the premium upgrade enthusiasts choose.\n  \u003c\/p\u003e\n  \n  \u003cp\u003e\n    Manufactured from 100 percent prepreg carbon fibre and autoclave cured at 125°C under ISO 9001 quality standards, the Karbonius CSL style airbox weighs just 1.7 kg and is widely regarded as the best CSL replica intake on the market. We have fitted and used this intake on customer S54 cars and feedback is consistently outstanding for sound, response and overall quality.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eWhy choose the Karbonius CSL style airbox\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthentic BMW E46 M3 CSL induction sound and feel on S54-powered E46 M3 and Z4M\u003c\/li\u003e\n    \u003cli\u003eReal performance gains with the correct remap, with up to 25 hp possible depending on car condition and mapping\u003c\/li\u003e\n    \u003cli\u003eUltra-light 1.7 kg construction in 100 percent autoclave prepreg carbon fibre\u003c\/li\u003e\n    \u003cli\u003eExceptional build quality, ISO 9001 process, each unit individually numbered for authenticity\u003c\/li\u003e\n    \u003cli\u003eOptimised airflow design for the S54 with carbon fibre trumpets and refined internal geometry\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eEngineered airflow improvements\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eCarbon fibre velocity stacks trumpets for reduced weight and superior thermal stability versus plastic\u003c\/li\u003e\n    \u003cli\u003eModified trumpet diameter and shape, 51.5 mm vs 50 mm, with rounded entries for smoother airflow\u003c\/li\u003e\n    \u003cli\u003eExclusive redesigned sixth trumpet to improve distribution to the last cylinder, verified 1 hp gain from this change\u003c\/li\u003e\n    \u003cli\u003eSoftened internal shapes and varnished interior to reduce turbulence and promote consistent flow\u003c\/li\u003e\n    \u003cli\u003eHermetic seal between front and rear sections using a neoprene foam gasket to keep the system airtight\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003ePremium materials and finish\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eCNC machined and anodised aluminium hardware\u003c\/li\u003e\n    \u003cli\u003eAluminium threads and stainless steel screws for durability\u003c\/li\u003e\n    \u003cli\u003eMeticulous carbon weave alignment for an OEM plus appearance\u003c\/li\u003e\n    \u003cli\u003eAggressive CSL look with a show-quality finish\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhat you get\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eKarbonius CSL style carbon fibre airbox intake plenum for S54\u003c\/li\u003e\n    \u003cli\u003eBracket for ventilation valve\u003c\/li\u003e\n    \u003cli\u003eM POWER sticker\u003c\/li\u003e\n    \u003cli\u003eCertificate of authenticity\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eAir filter not included. Available separately.\u003c\/p\u003e\n\n  \u003ch3\u003eFitment and compatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eBMW M3 E46, S54\u003c\/li\u003e\n    \u003cli\u003eBMW Z4M, S54\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eInstallation and mapping\u003c\/h3\u003e\n  \u003cp\u003e\n    Installation difficulty: Medium. No cutting or drilling required. A remap is required for correct operation and some additional parts are needed, not included. For professional fitting and mapping support, contact Nforcd in Warwickshire for a quote at Sales@nforcd.com.\n  \u003c\/p\u003e\n\n  \u003ch3\u003ePerformance and sound\u003c\/h3\u003e\n  \u003cp\u003e\n    Expect a sharper throttle response, improved mid-range pull and the spine-tingling CSL induction roar that makes the S54 legendary. Depending on the state of your car and the selected mapping you could see gains of up to 25 hp. Even without chasing maximum numbers, the driving engagement and response are transformed.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eQuality assurance\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eManufactured in Spain under ISO 9001 quality management\u003c\/li\u003e\n    \u003cli\u003e100 percent prepreg carbon fibre, autoclave cured at 125°C\u003c\/li\u003e\n    \u003cli\u003eEvery unit is individually numbered to guarantee origin and authenticity\u003c\/li\u003e\n    \u003cli\u003e5-year warranty against manufacturing defects\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eLegal notice\u003c\/h3\u003e\n  \u003cp\u003e\n    It is the customer’s responsibility to check local laws to ensure legality when using this product on public roads and highways.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eBuy with confidence from Nforcd\u003c\/h3\u003e\n  \u003cp\u003e\n    Nforcd supplies premium performance parts for BMW enthusiasts who want the best. We and our customers rate the Karbonius CSL style airbox for its quality, fitment and unrivalled CSL induction sound. For product advice, fitting in Warwickshire or a tailored quote, email Sales@nforcd.com.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eKey search terms\u003c\/h3\u003e\n  \u003cp\u003e\n    BMW E46 M3 carbon fibre airbox, E46 M3 CSL airbox, Karbonius airbox, CSL style airbox, S54 carbon intake, CSL plenum, BMW Z4M carbon airbox, E46 M3 induction kit, S54 intake upgrade, autoclave carbon fibre airbox, prepreg carbon fibre intake, E46 M3 carbon intake plenum, Z4M CSL style intake, E46 M3 airbox upgrade, S54 carbon airbox, BMW CSL induction sound, carbon fibre velocity stacks, carbon trumpets S54, OEM plus carbon airbox, best CSL replica intake.\n  \u003c\/p\u003e\n\u003c\/div\u003e","brand":"Karbonius","offers":[{"title":"1x1 \/ Gloss","offer_id":53961120776577,"sku":"E46AD02 - 1x1G","price":1999.99,"currency_code":"GBP","in_stock":true},{"title":"1x1 \/ Matte","offer_id":53961120809345,"sku":"E46AD02 - 1x1M","price":2099.99,"currency_code":"GBP","in_stock":true},{"title":"2x2 \/ Gloss","offer_id":53961120842113,"sku":"E46AD02 - 2x2G","price":1949.99,"currency_code":"GBP","in_stock":true},{"title":"2x2 \/ Matte","offer_id":53961120874881,"sku":"E46AD02 - 2x2M","price":1999.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0552\/9465\/6700\/files\/karbonius-carbon-fibre-airbox-csl-bmw-e46-m3-z4m-845556.jpg?v=1735826228","url":"https:\/\/www.nforcd.com\/products\/karbonius-carbon-fibre-airbox-csl-bmw-e46-m3-z4m","provider":"Nforcd","version":"1.0","type":"link"}