DownPipe Tttesting

Returns & Exchanges

In the event you:

• Purchased the incorrect part or size
• Were sent the incorrect product
• Purchased a product that arrived defective or damaged, or Accidentally purchased the wrong product

Please contact our customer service department for assistance. While each return category identified above has specific rules and conditions (please read below), there are general rules which apply to all returns or exchanges:

• All returns must be initiated within 30 days of the purchase date.
• All returns and exchanges must follow our Return Process which includes obtaining a valid RMA number from customer service.
• Product(s) must be in new condition and in the original packaging. In no event will we accept a product return that is damaged in any way or is in otherwise poor condition.
• Any returns related to defects, damage, fitment or other flaws will require additional inspection and evaluation. Depending on the product, we may also require that you return the product to the shipment source for inspection. In the event that you bring the product to your own mechanic who provides a report, we reserve the right to request verification by having the product shipped back to its original source for additional inspection.
• If you need to return an item that is an incorrect part, size, or was purchased in error, do not in any way assemble, install, or modify the product.
• Any product that has been used or has been fully or partially installed is non-returnable.
• In some cases, return of the physical product may not be required. This will be determined by our customer service department. For these products, instructions will be provided on how to process a field destroy or dispose of the original item.
• Orders that are fully or partially paid for with Affirm financing are only eligible for return if an RMA number is issued within 60 days of the order being placed, regardless as to when the order was shipped by Mach5 Performance or was received by the customer.

Items that cannot be returned include:

• Items Marked "Non-Returnable" (indicated on the product page)
• Custom Exhaust Systems
• Custom Turbo Components
• Custom Built Orders
• Wheel & Tire Packages
• Special Order Items: Special Order items include those that are custom made for the customer or are specifically for the customer’s vehicle. These items generally require a deposit or must be paid in full at the time of order. Once the deposit / payment in full is received from the customer the deposit / payment in full becomes non-refundable. Special order items cannot be returned or resold. Cancellations are not allowed on any special order parts.
• Items that are installed or altered in any way
• Clearance or scratch and dent items
• All shipping charges are non-refundable.

Shipping Charges for Returns and Refunds

For all orders delivered within the continental Taiwan 、 China and where the reason for return is based on the customer:

• No longer needing or wanting the product
• Purchasing the wrong product where the description is proper, or Providing any reason for return which is not related to a Mach5 Performance error

The return shipping costs and a return processing fee of 5% of the purchase amount per item will be deducted from the refund.

NOTE: 5% fee is primarily for handling and payment processing costs.

Defective, damaged, or incorrect products

While Mach5 Performance strives to ensure that the products purchased will be the right fit, the first time, in perfect condition and proper fitment, sometimes due to factors outside of our control, products may be damaged in transit, defective from the assembly line or otherwise are simply incorrect.

If your item(s) arrive defective, damaged, flawed or are incorrect, do not attempt to use, install, modify, or repair the item. Please contact our customer service team who will determine the best possible solution to your issue.

In the event of an exchange or replacement, once you have contacted our customer service team, our team will work with you to help facilitate the transaction. During this time, photos or video of the damage, defect, or fitment issues may be requested in order to correctly process your request.

In such instances, we will provide you with a prepaid return label to return the defective part. Upon return, we will inspect the part and upon confirmation of the defect, and our determination that the issue is not the fault of the customer, an exchange or replacement will be processed.

Products must be returned to us within 30 days of delivery. If the damage was caused by a shipping courier, we will schedule a damage pick up by the courier. Please note that products must be in the original packaging and there are additional requirements for products that ship via a freight carrier that our customer service team will discuss.

Please be advised that returns, refunds or exchanges under this section do not apply to warranty claims. Warranties on items are offered by their manufacturers, and each manufacturers' time frames, and terms and conditions vary. You can find more information on how warranty claims are processed by clicking HERE.

Free Shipping Disclaimer

Free shipping offers are only applicable to standard ground delivery service and are limited to delivery addresses within Taiwan or Mainland China. Truck freight and oversized charges still apply unless otherwise noted, and these services are only available for the aforementioned regions.

For all returned items subject to a free shipping promotion, the originally waived shipping cost will be removed from any refund provided. Restocking fees may also apply.

For items requiring freight, LTL shipping, or international / non-continental US shipping, while returns may be accepted subject to all the terms and conditions noted herein, please note that the shipping charges will be reduced in an amount based on an estimate from the shipping carrier, which may be substantially higher than the costs outlined above. As such, these shipping costs may exceed the cost of the product.

Also note that coordination of any return shipping will be the responsibility of the customer. In the event an error is made by Mach5 Performance, a return shipping label will be provided.

Restocking Fees

A 25% restocking fee will be applied to all non-defective returns. Restocking fees will be waived for returns wherein the customer opts to receive store credit, or an exchange for another item. Any items that are returned for any reason without all original packaging will be subject to a 25% restocking fee.

NOTE: Returns to store credit are still subject to the original shipping charges being removed from any refund provided

Refund form of Payment

Refunds will be processed in the form of payment the customer originally used (Credit Card, PayPal, Google, Affirm). For any refunds that cannot be processed in the form of payment originally used, we will process refund payments using ACH transfer which will require your banking information. Mach5 Performance reserves the right to provide refunds to customers in the form of store credit only in situations where refunding the customer cannot be processed via the original payment method or via ACH bank transfer. Please allow an additional 5-7 business days for the credit to appear on your account.

Why choose to upgrade the downpipe and ECU tuning as the most affordable, least invasive, and fastest performance improvement option?

1. Why is upgrading the downpipe and ECU tuning the most affordable performance upgrade option?

Upgrading the downpipe and ECU tuning can significantly increase horsepower and torque, with gains ranging from 10-40 horsepower depending on the vehicle model. This is particularly effective for turbocharged vehicles, improving responsiveness at idle and low speeds. Compared to replacing turbochargers or internal engine components, this type of upgrade is less expensive, easier to perform, and provides direct and noticeable performance improvements.

2. Why does this modification cause the least changes to the vehicle?

The downpipe and ECU tuning upgrades retain most of the factory settings. Especially with Mach5 Performance’s OEM-fit downpipes, they seamlessly match the stock exhaust system and installation position. No large-scale modifications to other key components are required, minimizing internal system complexity and reducing the need for maintenance and repairs.

3. Is this the fastest performance improvement solution?

Yes, the installation process for downpipes is typically short, with some vehicles requiring only 1-2 hours, and more complex vehicles taking up to a day. When paired with ECU tuning, the vehicle's performance is instantly optimized. Compared to internal engine modifications, this solution can significantly improve power output and throttle response in a short time.

4. What are the characteristics of Mach5 Performance’s OEM-fit downpipes?

Mach5 Performance’s downpipes are custom-made for each vehicle model using 3D scanning technology to ensure precise alignment with the factory location. This minimizes the need for adjustments during installation. All installation interfaces match the factory settings, simplifying the process and reducing unnecessary adjustments or rework.

5. Does upgrading the downpipe and ECU tuning affect environmental compliance and legality?

Downpipes without catalytic converters may cause the vehicle to fail emissions testing. Mach5 Performance offers versions with catalytic converters that reduce harmful emissions, ensuring compliance with local emissions regulations and minimizing environmental concerns.

6. Why does this upgrade improve turbo response speed?

By reducing exhaust system backpressure, the downpipe allows the turbocharger to release exhaust gases more quickly, speeding up turbo response and reducing throttle lag. This enhances acceleration performance, allowing the turbo to spool up faster, providing a more responsive driving experience.

Exhaust System Standards and Specifications

1. Why Follow the ISO Framework for Design?

Under the ISO standards framework, manufacturers must ensure that the exhaust system has excellent corrosion resistance, especially in humid and saline environments, helping to extend the system's lifespan and ensure reliability. Adopting standards such as ISO 13556 can prevent exhaust leaks, while noise control standards like ISO 5130:2019 ensure compliance with noise emission regulations.

• ISO 13556:1998 - Used to verify the airtightness of the exhaust system, testing for leaks under different pressures and temperatures to ensure stable performance.
• ISO 5130:2019 - Involves noise control testing to ensure noise levels comply with urban regulations at different speeds and loads.

Heat Load Management

1. Why is Heat Load Control Important for the Exhaust System?

Controlling the heat load of the exhaust system can prevent other critical components in the engine bay (such as cables, drive belts, ECU, etc.) from being damaged by overheating, ensuring long-term reliability. Proper heat load management can also improve engine performance, preventing unnecessary damage to the system caused by high temperatures.

2. How Does a Ceramic Insulation Layer Reduce Heat Load?

A ceramic insulation layer can block heat convection and radiation from the exhaust pipes, reducing the impact of high temperatures on the engine bay. This not only prevents intake temperatures from becoming too high, ensuring combustion efficiency, but also extends the lifespan of the exhaust system and other related components.

3. Why is Supporting Exhaust Backfire Part of Heat Load Management?

Exhaust backfire (afterburn) refers to the secondary combustion of fuel in the exhaust system, often occurring in high-performance vehicles. By controlling exhaust temperature, Mach5 ensures that backfire occurs within safe and controlled limits, enhancing visual effects and optimizing overall performance.

Exhaust Sound and Mufflers

1. How Do Mufflers Affect Exhaust Sound?

Mufflers reduce the volume of exhaust noise through internal soundwave reflection and absorption structures, particularly reducing high-frequency sounds. Different types of mufflers produce different effects; straight-through mufflers retain a louder exhaust sound, while multi-chamber mufflers effectively reduce noise.

2. How to Choose a Muffler Based on Personal Preference?

Straight-through mufflers are ideal for owners who prefer a louder, deeper exhaust sound, while mufflers with more soundproofing materials are suitable for those who prefer a quieter experience. If you have custom sound requirements, you can choose different materials and designs to adjust the sound.

3. Can I Customize the Exhaust Sound?

Yes! We offer customized solutions. Tailoring the exhaust sound involves multiple adjustments, as factors such as environment and vehicle configuration can affect the actual results. If you are willing to invest time and budget, we will strive to create the perfect exhaust sound for you. For more information, please contact [email protected].

4. Does Modifying the Muffler Affect Vehicle Performance?

Generally, modifying the muffler does not directly affect engine performance, but it can change exhaust backpressure, which in turn affects engine output. Choosing the right muffler is crucial; a well-designed muffler can maintain low backpressure and provide the desired sound, while a poorly designed one may increase backpressure and reduce performance.

5. Can Upgrading the Muffler and Downpipe Significantly Improve Exhaust Sound?

Yes, upgrading the muffler and downpipe can greatly enhance the exhaust sound. A downpipe reduces exhaust backpressure, and combined with a suitable muffler design, you can achieve a more powerful exhaust sound.

Precautions and Warnings

1. Legal and Decibel Requirements for Vehicle Exhaust Noise

Noise regulations vary by region. When modifying, ensure compliance with local noise limits and emission regulations. If in doubt, consult local motor vehicle authorities or legal counsel for legal advice. Mach5 Performance does not provide legal guidance.

2. California Proposition 65 Warning

This product may contain chemicals known to the state of California to cause cancer or reproductive harm. For more information, visit P65warnings.ca.gov.

3. EU REACH Compliance

Our products comply with EU REACH regulations, ensuring they are free from harmful substances. For more information, visit the European Chemicals Agency (ECHA).

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