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ARM Motorsports BMW 335i 3.5" Resonated MidPipe

SKU: N54MID

Sale price$697.00 Regular price$797.00

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Product Information

    The ARM BMW 335i 3.5" Resonated Midpipe replaces the restrictive factory dual midpipes with a single, high-flow 3.5" design engineered to improve exhaust efficiency while delivering a deeper, smoother exhaust note. By merging the exhaust flow into a single, 3.5" midpipe, backpressure is reduced and overall exhaust flow is improved. The factory BMW 335i midpipe uses a dual midpipe design which incorporates secondary catalysts which prioritizes noise control and mass production over performance and sound quality. While effective for daily driving, the OEM setup creates unnecessary restriction and limits exhaust flow as power levels increase.



    The ARM 335i 3.5" Single Midpipe is designed to connect directly to the factory axle-back section, allowing full retention of the OEM exhaust valve controllers and factory valve operation. This maintains OEM drivability and comfort in normal driving conditions while unlocking a more aggressive and engaging sound under throttle.  The ARM 335i 3.5" Resonated Single Midpipe prioritizes exhaust note and performance. The integrated resonator is carefully sized and positioned to reduce rasp and harsh frequencies commonly associated with straight-through midpipes, especially on N54 and N55 platforms.
    The ARM 335i 3.5" Single Midpipe begins with a dual 2-bolt flange design which allows you to connect it with any downpipes that mate up to the OEM 335i midpipe. This allows the midpipe to bolt directly to any downpipes that are designed to mate to the OEM 335i midpipe, including factory downpipes as well as most aftermarket downpipes that retain the OEM-style 2-bolt outlet configuration. 


    It then transitions smoothly to the 3.5" single midpipe section.  This section incorporates a single resonator to deepen and improve the exhaust note by reducing rasp and high-pitched tones. The resonator is designed to attenuate high-frequency and raspy exhaust notes commonly associated with turbocharged BMW engines, while preserving a deep, aggressive tone under acceleration. The result is a smoother, more controlled exhaust sound without introducing excessive restriction or drone.


    Towards the rear section of the ARM 335i 3.5" Midpipe splits back to a dual design to connect with the OEM axle-back exhaust section. By retaining the factory dual outlet layout at the rear, the ARM midpipe preserves full compatibility with the OEM axle-back and its integrated exhaust valve system. This ensures proper exhaust flow distribution, correct valve operation, and OEM-level fitment, while maintaining the performance and sound benefits of the single 3.5" midpipe design throughout the center section.

    To allow for clearance of the OEM chassis brace, the ARM 335i 3.5" Resonated Midpipe includes two precision machined aluminum chassis brace spacers which allow extra space for the larger 3.5" ARM Midpipe to pass through to the axle-back section. This solution allows the larger midpipe to pass through without contact or vibration while retaining the factory chassis brace and its structural function. The spacers are designed specifically for correct fitment and alignment, ensuring a clean installation without cutting, bending, or permanent modification to the vehicle.

    Features:

    • 3.5" Single Midpipe Design
    • Integrated Resonator for Refined Sound                                                           
    • Improved Exhaust Flow
    • Retains OEM Exhaust Valve Functionality

    What's Included:

    • 3.5" Single Midpipe Front Section
    • 3.5" Single Midpipe Rear Section                                                                                   
    • 2x Axle-Back Adapter Pipe                                                                                             
    • 2x Chassis Brace Spacers
    • 2x Downpipe Gaskets
    • Mounting Hardware

    RWD VEHICLES ONLY
    Make Chassis Model Engine
    BMW E90 335i N54 3.0L
    BMW E90 335i N55 3.0L
    BMW E92 335i N54 3.0L
    BMW E92 335is N54 3.0L
    BMW E92 335i N55 3.0L

    NOTE: Product images shown may not be an exact representation of the actual product.

    Model   + Drivetrain  
    E90 335i 3.0T I6 [N54] +
    E90 335i 3.0T I6 [N55] +
    E92 335i 3.0T I6 [N54] +
    E92 335i 3.0T I6 [N55] +

    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.
    Additional Notes
    • 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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