MAD BMW F & G Chassis 5" B58 Catted Downpipe M240 340 M340 440 M440 540 W/ No CEL Guarantee & Bracket
- Description
- Fitment
- Refund Policy
Upgrade your stock B58 downpipe to the MAD B58 Catted Downpipe for more power, better sound, and guaranteed reliability without triggering a check engine light.
The MAD Catted B58 Downpipe is the ideal performance upgrade for BMW owners who want more out of their car without the hassle. It's made from premium 304 stainless steel and built to handle extreme heat and tough driving conditions.
The smooth piping design allows for maximum exhaust flow, which translates into more horsepower, better torque, and sharper throttle response. The 300-cell high-flow catalytic converter gives you noticeable gains and a more aggressive sound, all while keeping the check engine light off.
Installation is simple with a direct bolt-on fit to the stock exhaust system. No cutting or welding needed. It's also fully compatible with most aftermarket exhaust setups, giving you the flexibility to build the setup you want.
No check engine light guarantee
If you get a CEL related to the catalytic converter, MAD will replace the downpipe for free.
Warranty coverage
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1-year warranty on the catalytic converter
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Lifetime warranty on the downpipe for defects and fitment
Race use only
Features
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No CEL guarantee or it's replaced free
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Compatible with right-hand drive and left-hand drive vehicles
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Smooth bends for maximum airflow without drone
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Gains up to 30 horsepower on stock turbos and even more with upgraded ones
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Lifetime warranty on the downpipe
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1-year warranty on the catalytic converter
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90-day return policy
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Ships in 1 to 2 business days
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Direct bolt-on fitment
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Flex section for durability
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300 cell high-flow catalytic converter
Fitment
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2015 and up BMW M240i and XDrive
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2016 to 2019 BMW 340i and XDrive
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2020 to 2024 BMW M340i and XDrive (does not fit 2025+)
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2016 and up BMW 440i and XDrive
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2016 and up BMW 540i and XDrive
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2016 and up BMW 740i and XDrive
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2017 to 2020 BMW X3 M40
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2017 to 2020 BMW X4 M40
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2019 and up G05 BMW X5 40i and XDrive
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2019 and up G07 BMW X7 40i and XDrive
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2019 and up G29 BMW Z4 M40i
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2019 and up Toyota Supra 3.0L
Disclaimer
For race use only. This product is not certified for use on public roads and may not comply with local regulations. Always check your local laws before installing.
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.
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.
