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HFE x3m x4m Downpipe Catless Decat with fitting kit and exhaust bolts
HFE BMW X3M F97 4.5″ Decat Downpipes – Performance Exhaust Upgrade
HFE BMW X3M F97 4.5″ Decat Downpipes – Performance Exhaust Upgrade
HFE BMW X3M F97 4.5″ Decat Downpipes – Performance Exhaust Upgrade
HFE BMW X3M F97 4.5″ Decat Downpipes – Performance Exhaust Upgrade
HFE x3m x4m Downpipe Catless Decat with fitting kit and exhaust bolts
HFE BMW X3M F97 4.5″ Decat Downpipes – Performance Exhaust Upgrade
HFE BMW X3M F97 4.5″ Decat Downpipes – Performance Exhaust Upgrade
HFE BMW X3M F97 4.5″ Decat Downpipes – Performance Exhaust Upgrade
HFE BMW X3M F97 4.5″ Decat Downpipes – Performance Exhaust Upgrade

HFE BMW X3M F97 4.5″ Decat Downpipes – Performance Exhaust Upgrade

£419.99

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High Flow Engineering 4.5″ Decat Downpipes Performance Exhaust Upgrade

Take exhaust performance on your BMW X3M F97 to the next level with the HFE 4.5″ Decat Downpipes. Designed for maximum flow, these oversized downpipes replace the restrictive factory catalytic sections, significantly reducing backpressure and allowing the S58 engine to breathe more freely. This foundation upgrade is ideal for high-power builds, track cars, and serious performance applications.

⚠ IMPORTANT – ROAD USE, EMISSIONS & MOT NOTICE

These downpipes remove the factory catalytic converters and are designed for off-road, motorsport, or track use. They are not UK emissions compliant and may result in a UK MOT emissions failure. ECU tuning is recommended after installation for optimal performance and drivability.

Key Features＋
  • Oversized 4.5″ Diameter: Maximum exhaust gas flow for high-output S58 engines.
  • Decat Design: Removes the catalytic restriction for freer flow.
  • High-Grade 304 Stainless Steel: Durable, heat-resistant construction.
  • Mandrel-Bent Tubing: Smooth internal profile for improved flow and reduced turbulence compared to other heavily welded sections on competitors.
  • Improved Turbo Efficiency: Reduced backpressure enhances spool and performance.
  • Performance Exhaust Tone: Delivers a deep, aggressive exhaust note.
Why Choose 4.5″ Decat Downpipes?＋
  • Factory downpipes are a major restriction on high-output S58 engines.
  • Oversized 4.5″ design supports extreme power levels and big turbo setups.
  • Reduces exhaust backpressure at high RPM and under load.
  • Enhances exhaust character and supports track performance builds.
  • A popular upgrade for Stage 2 and Stage 3+ vehicles.
Technical Specifications＋
  • Material: High-grade stainless steel
  • Diameter: 4.5″ high-flow tubing
  • Configuration: Decat (no catalytic converters)
  • Construction: Mandrel bent & welded
  • Fitment: Direct replacement for factory downpipes
Vehicle Compatibility＋
  • BMW X3M: F97 (2019+)

✔ S58 twin-turbo engine only
✔ Compatible with factory or aftermarket exhaust systems
✔ ECU tuning recommended
*Fitment confirmed for X3M – always verify before ordering

Installation＋
  • Remove the factory downpipes and catalytic sections.
  • Fit the HFE 4.5″ decat downpipes using OEM mounting points.
  • Check clearances and alignment before tightening.
  • ECU remapping is strongly recommended before driving.
  • Professional installation advised.
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⚠️ DISCLAIMER Unless explicitly stated otherwise, all products sold by DC Prestige Online LTD are designated race-only and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may be in violation of local, state, and Federal laws. DC Prestige Online LTD does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer. Read our full terms of service here.

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Last updated: 07/09/2025

We want you to be confident when shopping with us. This page explains your rights and our terms for deliveries, returns, refunds, exchanges, and digital products. It applies to UK and international customers.

1. Standard Returns (UK & International)

  • Notify us within 14 calendar days of receiving your order if you wish to return.
  • Once approved, you have a further 14 days to send the goods back.
  • Items must be unused, uninstalled, and in original packaging, with proof of purchase.
  • Refunds are processed to your original payment method within 14 days of receiving goods (or proof of postage).

Note: Standard delivery costs will be refunded; upgraded shipping (e.g., next-day) is non-refundable. You are responsible for return postage unless the item is faulty, damaged, or incorrect. Used, installed, or damaged goods beyond reasonable inspection may incur up to 50% deduction from the refund.

2. Special Order & Custom Goods

  • Special-order parts must be returned within 7 days (if non-faulty) and may incur up to a 50% restocking fee, depending on supplier terms.
  • Custom-made or made-to-order goods are non-returnable unless faulty or not as described.
  • Faulty or incorrect items may be returned within 30 days for refund, repair, or replacement.
  • Customers are responsible for providing accurate specifications; we are not liable for errors due to incorrect information.

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  • All products are inspected before dispatch.
  • If your order arrives damaged, faulty, or incorrect:
  • Contact us immediately with clear photos of the product and packaging.
  • We will cover return shipping costs and issue a refund, repair, or replacement.
  • If a parcel arrives visibly damaged, sign as “damaged” (if possible) and notify us straight away.

4. Non-Returnable Items

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5. Exchanges

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  • Customers are responsible for return and new delivery costs.
  • If the exchange is due to a faulty or incorrect item, we will cover return shipping and send the replacement free of charge.

6. Installation at D&C Prestige

  • Cancellations or changes made less than 48 hours before your installation appointment will forfeit your fitting deposit.
  • If you cancel and request a product refund, a 15% restocking fee applies, along with the deposit fee (if applicable).

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  • Tracking information will be provided once the order is shipped.
  • International customers are responsible for customs duties, taxes, and import fees unless the item is faulty or incorrect.
  • Refunds for international returns are issued in GBP. Currency conversion fees, bank charges, and international transaction costs are the customer’s responsibility.
  • We are not liable for customs delays, clearance costs, or refusal of goods by customs authorities.

For full details, see our Shipping Policy.

8. Digital Products (Downloads, Codes, Software)

  • Digital content (e.g., Bootmod3, XHP) is typically delivered immediately or within 24 hours via email or account access.
  • By purchasing, you agree that delivery is deemed to have started once payment is made, and you waive your right to cancel under the 14-day cooling-off period allowed by UK law.
  • Refunds are only provided if the product is faulty, inaccessible due to our error, or not as described.
  • You are responsible for ensuring compatibility with your vehicle, hardware, or software; refunds are not offered if supplied correctly but incompatible due to buyer error.
  • International customers agree to the same terms.

9. How to Start a Return

  1. Visit our Contact Page and provide your full name, order number, and reason for return.
  2. Wait for return authorisation and instructions before sending your item.
  3. Once received and inspected, we’ll notify you of approval or rejection of your refund.

Proof of return: Customers must retain proof of postage for all returns. Tracked and insured services are strongly recommended.

Refund method: Refunds are issued only to the original payment method used for the purchase. We cannot refund to alternative cards, accounts, or payment services.

Refused or undeliverable parcels: If a delivery is refused, unclaimed, or undeliverable due to incorrect address details provided, the customer will be responsible for return shipping costs and any applicable restocking fees.

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HFE BMW X3M F97 4.5″ Decat Downpipes – Performance Exhaust Upgrade