This is a Universal Fitting Product
This Part Fits Your Vehicle
Product Information
The G8x M3/M4 is arguably superior in every category to its predecessor but in most, if not all, circles the biggest downfall of the platform is in the sound department. Like the F8x before it with the S55, the S58 in the current generation leaves a lot to be desired. While a step in the right direction from its forerunner the stock vocals still carry far too much rasp that do not fully articulate the refined aggressiveness typical of the brands signature performance models. Dinan corrects this weakness with a valved axle back exhaust system that elevates the tone to a deeper, more meaningful note while also delivering an extra level of amplification above and beyond its stock counterpart. Coupled with the optional middle exhaust / x-pipe for the platform an even louder, smoother, and fuller soundtrack is possible.
Through extensive development and testing nearly every possible permutation of the exhaust was attempted. Unlike the previous generation where cabin sound/drone was largely unchanged between the sedan and the coupe, that was not the case with the G8x chassis'. This caused countless iterations to be attempted in the quest for a common system that not only sounded superb externally but one that also didn't introduce an overbearing internal cabin drone on either body type. The result is a system we are confident will be coveted by all for years to come. To achieve desired sound volume and tone worthy of the G8x M3/M4 the tubing was enlarged to 76mm (vs 70mm stock) to allow freer flow, and reduce backpressure, throughout the entirety of the system. The larger piping gives way to multiple pathways as it nears the rear of the vehicle -- the choice of which is utilized determined by the factory exhaust valves which are retained. When valves are closed, flow is directed into the Dinan muffler, where absorption and reactive technologies are used, and exit out the two inner tips. This limits noise during low-speed driving and produces a more subdued, albeit deeper, and agreeable note. However, when the valves are open during high-load conditions the bulk of the gases bypass the muffler altogether for a near straight pipe design and maximum aural enjoyment to be achieved. It's the perfect marriage for all tastes and allows civility or impassioned aggression depending on what the situation demands. The combination is one Dinan has deemed fitting for the marques signature performance models that cater to the tasteful enthusiast who demand the best for all situations.
Visually, the Dinan G8x M3/M4 exhaust has been skillfully crafted entirely out of T304 stainless steel and TIG welded for the best visual appearance and color. The entire system is then brush finished to further guarantee an immaculate looking system out of the box. The attention to detail is not limited to parts of the system you can't see once the exhaust is installed but is also extended to the exhaust tips themselves. The Dinan exhaust includes massive, quad 4.5-inch (114mm) clamp-on, double-walled, polished or black ceramic coated clamp-on tips and laser engraved exhaust tips. Despite the seemingly cartoonish size on paper, the tips mesh seamlessly and fill the factory cut-outs to complete the OEM+ look with a healthy dose of audible attitude.
Features:
- Maximum gains of +6 HP and +5 lb-ft of torque
- Enjoyably louder, sportier sound
- Drone abatement technologies used to reduce cabin resonance
- Four, diffuser filling, 4.5-inch (114mm) double-walled, polished or black ceramic coated clamp-on tips with laser engraved Dinan logo
- Larger diameter piping for increased flow (76mm vs. 70mm)
- 6-pounds lighter than the stock axle back (Stock: 44-pounds vs. Dinan: 38-pounds)
- Stock exhaust valve actuators reused, and operation of exhaust valve is unchanged so exhaust tone can be adjusted via the M-drive settings
- Computer controlled exhaust valves are retained and limit noise during low-speed driving and open fully during high-load conditions
- 100% 304 Stainless Steel construction
- Factory-like fitment with included mounting hardware
What's Included:
- DINAN Valved Axle-Back Exhaust
NOTE: Product images shown may not be an exact representation of the actual product.
Model  +  |
Drivetrain  |
|---|---|
| G80 M3 3.0T I6 [S58] | + |
| G82 M4 3.0T I6 [S58] | + |
| G83 M4 3.0T I6 [S58] | + |
Return and Exchange Policy
The Return & Exchange Policy below outlines our current terms. While we try to adhere strictly to the guidelines detailed below, there are always exceptions to the rules, please speak to a BMP Tuning Customer Support Representative for clarification on anything you might have questions about - contact us.
Order Cancellations
Order Cancellation Hours of Operation
- All order cancellations are processed during regular business hours only. Any order cancellation requests made outside of normal business hours will be processed during the next business day.
Order Cancellation Fees
- Any cancelled orders including orders that have not shipped will be subject to a 5% cancellation fee to offset order processing fees that are not refunded to BMP Tuning by financial institutions and fee is waived completely if store credit is requested.
- Cancellation fee applies to any order regardless of stock status, please contact BMP Tuning if there are any questions regarding stock status before placing an order.
- If an order has already been processed or shipped and BMP Tuning is unable to cancel the order, the customer will be responsible for returning the item to us once received. Once the return is received it will be processed like any other return and be subject to the "Return and Exchange Policy" listed below.
- Certain products sold cannot be cancelled after the order has been placed due to agreements with the manufacturer, or in the case of made to order/custom items. This may be noted in the product description, but feel free to contact us to make sure before ordering.
- Any order placed via Katapult are non-refundable; refunds, if required, will be issued via store credit only.
Return & Exchange Policy
Domestic Orders
- BMP Tuning will accept returns for unused products within 1 year/365 Days from the date of purchase.
- Returned products must be new, unused, and must be in the original packaging, including labeling, manuals, hardware, etc. Special order items are non-refundable.
- Returns will NOT be processed for any received products without the proper RMA Form completed and included with the return, customer will also be responsible for return shipping to their original shipping address.
- Returns beyond 60 days of original purchase once processed can only be refunded as BMP Tuning store credit.
- In the case of an exchange, BMP Tuning will waive normal restocking fees and only collect for original shipping of the returned product unless otherwise stated by a BMP Tuning Customer Service Representative when requesting your RMA number.
- Once store credit has been issued for a return, it is final and cannot be reversed or exchanged for a refund to your original payment method at a later time. Please ensure you are comfortable with receiving store credit before completing your return.
- Contact us within 7 days of delivery if an item has arrived damaged or incorrectly so that we can rectify the situation with the responsible party. Any notifications past 7 days from delivery could cause issues with replacement and BMP Tuning is not liable for any mis-shipments or damaged items if notified past the 7th day.
- Once delivered to shipping address provided, packages are customer’s responsibility—consider requesting a signature upon delivery or insuring your order with Route.
International Orders
- New, unopened products can be returned within 60 days of purchase.
- Opened/used products and Scratch & Dent parts cannot be returned.
- Contact us within 7 days if your item is damaged upon receipt.
- Once delivered, packages are customer’s responsibility—signature confirmation is available upon request.
- Any international orders that are refused at the time of delivery will be subject to carrier abandonment of the package, at which time the ordered products would be discarded by the carrier. The customer will not be refunded for the value of the order and the discarded products are no longer retrievable.
Return Fees & Shipping:
- Customer is responsible for a 20% restocking fee, original shipping, and return shipping.
- In instances where the customer received FREE shipping, the shipping amount that BMP Tuning paid on behalf of the customer will be deducted from the total refund.
- BMP Tuning's restocking fee is waived in the instance customer requests store credit as long as the item is being returned to BMP Tuning and not the manufacture directly.
- Any orders that are returned to BMP Tuning as refused by receiver or non-deliverable will be subject to a return handling fee and will be processed as a return in compliance with our "Return and Exchange Policy", including a 20% restocking fee.
- Any returns that are denied for any reason will be sent back to the customer at the customers expense. Any denied return left with BMP Tuning longer than 30 days is considered forfeited by the customer and will be disposed of by BMP Tuning at BMP Tuning's discretion.
- Any order placed via Katapult are non-refundable; refunds, if required, will be issued via store credit only.
Route Shipping Protection - Refunds & Cancellations
- Route shipping protection is an insurance purchased for your shipment. Because of this, any protection on items that have already been shipped cannot be refunded.
- If your order is cancelled PRIOR to the items shipping, then the Route purchase can be refunded with the cancelled item(s). Once the order has shipped, we cannot refund the Route shipping protection.
Tariffs & Duties – No Refund Upon Return
- BMP Tuning is not responsible for any tariffs, duties, or import fees charged by customs authorities or shipping carriers.
- If you return an item, any tariff or duty you paid at delivery will not be refunded by BMP Tuning, as those are non-refundable government charges.
- Refunds for returned items will be limited to the cost of the product (minus applicable fees), not including any tariffs or duties originally paid.
- Please ensure you understand your country’s import fee obligations prior to ordering.
- If you have questions about potential tariffs, duties, or returns, contact us before placing your order—we’re happy to assist.
- All existing policy conditions (restocking fees, RMA requirement, return shipping responsibilities) still apply as stated in the original policy.
Product Return Exemptions
Tuning Software And Cables
BMP Tuning will NOT accept returns for any tuning software or tuning cables. This includes, but is not limited to:
- ECU Tunes
- TCU Tunes
- Tuning Cables such as IE POWERlink V4 Flash Cable, APR Ultralink, Unitronic UniCONNECT+ Cable, 034Motorsport Dynamic+ Tuning Cable
- Plug and Play Tuners such as Burger Motorsports JB4, COBB AccessPort
- OBDEleven Pro
Scratch & Dent, Open Box, and Clearance Items
There are absolutely no returns on any product sold as "Scratch & Dent", "Open Box", or "Clearance."
Pricing Or Photo Errors
- While we always try to provide the most accurate product and pricing information, we are humans and can make mistakes. If we listed an incorrect price or information for any product on our site, BMP Tuning reserves the right to refuse or cancel any orders placed. PRICING AND AVAILABILITY ARE SUBJECT TO CHANGE WITHOUT NOTICE.
- We try to ensure that all products are represented properly in description and photo. However, due to photos provided from manufacturers, sometimes a photo might be outdated or a generic photo for the part may be used for the item. If you have any questions about any product, please contact us before placing your order.
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