- Description
- Fitment
- Refund Policy
The Karbonius E46 M3 (S54) Carbon Airbox - OEM Style is the ideal solution for enthusiasts who want the unmistakable CSL induction character without the complexity of a full CSL airbox conversion. Designed as a direct-fit replacement for the factory plastic airbox, it delivers a dramatic improvement in intake sound — measured at +12 dB over the OEM unit — while saving approximately 8 lbs compared to the original plastic assembly.
Unlike the factory CSL airbox, which requires additional hardware, wiring, and software calibration, the Karbonius OEM Style airbox retains the standard intake elbow and MAF sensor, making it a straightforward, no-remap upgrade. Karbonius documented a +4 HP result in recent dyno testing versus the OEM plastic airbox; however, given the 2% margin of error inherent in dynamometer testing, Karbonius makes no significant power claim — simply no power loss, and a substantially improved intake experience.
Each airbox is manufactured from 100% prepreg carbon fiber and autoclave-cured in Spain under ISO 9001 quality management standards. The high-gloss UV-protective varnish finish accentuates the carbon weave while providing long-term durability. Every piece is individually numbered to guarantee authenticity and origin.
What's Included
- OEM-style carbon fiber airbox
- CNC-machined anodized aluminum components
- Stainless-steel hardware
- Numbered certificate of authenticity
Product Details
- Intake sound improvement: +12 dB vs. OEM plastic airbox
- Approx. 8 lb weight savings over OEM plastic airbox
- No ECU remap required — uses standard intake elbow and MAF
- 100% prepreg carbon fiber construction
- Autoclave-cured for superior thermal and structural stability
- High-gloss UV-protective varnish finish
- Individually numbered for authenticity
Required Installation Components (Sold Separately)
- For E46 M3 SMG models: Genuine BMW M3 CSL SMG reservoir and bracket
- For 2005–2006 M3 and Z4M: Pre-2005 throttle body boots and a modified crankcase breather hose
Related Products
Returns
Our policy lasts 14 days. If 14 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. All items are subject to 15% restocking fee from the manufacturer.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
Additional non-returnable items:
Gift cards
Downloadable software products
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer.
There are certain situations where only partial refunds are granted (if applicable)
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of shipping to you will be deducted from your refund. If your original order qualified for free shipping, the actual cost of shipping the item to you will still be deducted from your refund.
If you would like to start a return please click here
Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of shipping to you will be deducted from your refund. If your original order qualified for free shipping, the actual cost of shipping the item to you will still be deducted from your refund.
Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again. Then contact your credit card company, it may take some time before your refund is officially posted. Next contact your bank. There is often some processing time before a refund is posted. If you’ve done all of this and you still have not received your refund yet, please contact us at info@amtuning.ca.
Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.
Labor Fees (if applicable)
AM Tuning Canada is not responsible for, and shall not be liable for, any labor fees, installation charges, removal charges, diagnostic fees, or other service-related costs incurred by the customer or any third party in connection with the installation, removal, modification, servicing, or use of any products purchased from AM Tuning Canada. Unless expressly agreed to in writing by AM Tuning Canada, all such labor and service costs are the sole responsibility of the customer.
Exchanges (if applicable)
To start an exchange, click here
Non-refundable items
The following items are non-refundable and non-returnable once purchased: oils, fuel or oil additives, filters, tuning cables, OBDeleven products, Braum seats, spark plugs, coil packs, and similar consumable, wheel spacers, wheels bolts, license plate brackets, electronic tuning components and any other product subject to discretion of AM Tuning Canada.
Other products from brands such as MHD, Bootmod3, Ecutek, Braum racing, Novitec are also non-refundable and non-returnable.
All sales of these items are final and are subject to the policies and discretion of AM Tuning. By completing a purchase, the customer acknowledges and agrees to these terms.
