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HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel
HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel
HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel
HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel
HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel
HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel
HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel
HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel
HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel
HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel
HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel
HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel

HFE S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel

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High Flow Engineering G82 / G83 M4 S58 Decat Downpipe 3″ Stainless Steel

Unlock the hidden potential of your BMW S58 engine with the HFE 3″ Decat Downpipe. Precision-engineered from high-grade stainless steel for maximum exhaust flow, this downpipe reduces backpressure, improves turbo spool, and contributes to significant power gains. Ideal for tuned road cars and track-focused builds.

⚠ IMPORTANT – OFF-ROAD / MOT & EMISSIONS NOTICE

This decat downpipe removes the factory catalytic converter and is intended for motorsport or off-road use only. It is not UK emissions compliant and may fail a UK MOT or roadside emissions inspection. Installation may trigger engine management lights unless corrected with ECU calibration.

Key Features＋
  • High-Flow 3″ Design: Maximises exhaust flow and reduces backpressure.
  • 304 Stainless Steel Construction: Heat-resistant, corrosion-proof and built for high-output engines.
  • Mandrel Bent Tubing: Smooth internal transitions for unrestricted gas flow.
  • TIG Welded Joints: Strength and durability under extreme temperatures.
  • Direct Replacement: Designed to bolt directly in place of the OEM downpipe.
  • Enhanced Exhaust Sound: Louder, sharper and more aggressive tone.
Why Upgrade Your S58 Downpipe?＋
  • Improves turbo response and reduces lag.
  • Allows the S58 engine to breathe more efficiently.
  • Supports higher power levels on tuned vehicles.
  • Essential upgrade when fitting intakes, ECU tunes or performance exhausts.
  • Ideal for track cars and performance-focused builds.
Technical Specifications＋
  • Material: 304 Stainless Steel
  • Pipe Diameter: 3″ (76mm)
  • Construction: Mandrel bent & TIG welded
  • Fitment: Direct bolt-on replacement
  • Weight: Lighter than OEM catalytic section
  • Sound: Increased volume and aggression
Vehicle Compatibility＋
  • BMW M3: G80 / G81 (2021+)
  • BMW M4: G82 / G83 (2021+)

✔ Fits S58-powered G-series models
✔ ECU remap recommended after installation
✔ Lambda spacers may be required to prevent engine warning lights

Installation＋
  • Direct replacement for factory downpipe.
  • Professional installation strongly recommended.
  • ECU tuning advised to optimise performance.
  • Intended for off-road or motorsport use.
Frequently Asked Questions＋

Q: Will this pass a UK MOT?
A: No. This is a decat downpipe and is not emissions compliant for UK road use.

Q: Will I need a remap?
A: Yes. An ECU remap is recommended to avoid engine warning lights and maximise gains.

Q: Does this fit aftermarket exhaust systems?
A: It is designed to work with the factory system and most aftermarket cat-back exhausts.

Q: What’s included in the kit?
A: The downpipe and nut/bolt kit only. Gaskets and tuning are sold separately.
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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.

3. Damaged, Faulty, or Incorrect Items

  • 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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  • Hazardous materials, flammable liquids, or gases
  • Services such as painting, ceramic coatings, or extended warranties

5. Exchanges

  • To exchange an item, return it via the standard process and place a new order for the replacement.
  • 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).

7. Shipping & International Deliveries

  • In-stock items typically dispatch within 1–2 business days; some items may take up to 72 hours or longer during busy periods.
  • 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 S58 3″ Decat Downpipe – BMW M4 G82 G83 – High Flow Performance Stainless Steel