Customer Service FAQs

What if I want my order shipped to a location other than my billing address?

If you wish to have item(s) shipped to an address other than your billing address, please be aware that your order may require additional verification and may be subject to processing delays. We recommend allowing extra time for order fulfillment if you are shipping to an alternate address and have a specific delivery deadline. If you have any questions about the verification of your order please feel free to contact our customer service department.

Can I cancel my order?

If you need to cancel your order, please contact our customer service department for assistance. We can cancel any order that has not been processed. If your order is currently in processing or has already been shipped, you must go through the complete return process in order to obtain a refund for your order. For more information about the terms and conditions which will govern your return, please refer to our Return Policies page.

JST Performance custom tunes are non-tangible products and as such, cannot be returned or refunded once the tuning process has begun. If you have not submitted your information sheet after purchase and would like a refund on a custom tune, please contact our tuner via email at for a refund approval. Custom tunes are subject to a 10 day refund policy.

What should I do if I want to return a product?

In order to return a product a Return Merchandise Authorization (RMA) number is required. An RMA can be obtained by contacting us via email at All returns are REQUIRED to be accompanied by an RMA. Before returning your product, we ask that you familiarize yourself with the guidelines found on our Return Policies page to ensure your return shipment meets all of the RMA conditions and return policy requirements. Failure to comply with the terms stated in our return policy and on the RMA form may result in delayed return processing and/or refusal of returned packages. Please be aware that we will not accept a return if the item has been opened, installed, or otherwise used in any way. Items that were shipped incorrectly, have been damaged in transit, or which require warranty repair or replacement are not covered by our Standard Return Policy and must be reviewed by a member of our customer service department. If you have any questions regarding the return process that have not been answered here, or on our Return Policies page, please contact one of our customer service representatives.

What should I do if I received the wrong item?

If you think you've received the wrong product, please double-check the part number on the product label with the part number listed on your online order. If those numbers do not match, please contact one of our customer service representatives via email before opening or using your product. We recommend you have your order number and product packaging on hand to expedite your claim. Do not discard any of the parts or packaging as these items will be needed in order to qualify for a return and/or replacement shipment.

What should I do if my shipment was delivered damaged?

If your shipment becomes damaged or lost in transit, please notify one of our customer service representatives immediately via email at Please do not discard any boxes or packaging materials that were included with the shipment. All original products and packaging materials must be provided in order to fully process a damage claim. JST Performance is not liable for shipping claims that are denied due to customer negligence.

What happens if my item proves defective after installation?

If you recently purchased a product from JST Performance and are concerned about the fitment or performance of your item, please contact a member of our customer service department for assistance. Our customer service representatives can provide installation support, troubleshooting advice, and assistance in identifying the possibility of any manufacturer defects. If we suspect your product does have serious defects, our customer service department can serve as a contact with the manufacturer to help arrange a warranty inspection and, if applicable, any necessary repairs or replacement shipments. If you wish, you may also contact the manufacturer directly for information regarding product eligibility and specific terms and conditions of warranty coverage.

What if I see a product listed at a lower price than I paid?

As part of our continuing commitment to offer our customers the best possible price on any given product, JST Performance often adjusts its pricing in accordance with fluctuations in the market. As a result of such constant change, no reimbursements or price adjustments will be made after your order has been processed. 

Does JST Performance price match?

At this time, we do not offer price matching. We understand how valuable your money is to you, and that's why all of the products on our site are currently listed at the best possible price. Please keep in mind that JST Performance is an authorized dealer for every item we sell and as such, we are committed to maintaining the integrity of every product. As always, if you have questions about a product or need installation support, assistance from our friendly customer service department is available throughout the week with extended hours to help assist in getting you the quickest possible support.

We do offer custom quotes for discounted in-house installation that may include the purchase of products listed on our website. If you are interested in obtaining a quote for product and installation, please contact a sales representative via email at

Does JST Performance charge sales tax?

JST Performance only charges sales tax on orders placed by Georgia residents. If your order is shipped to any other state, sales tax will not be charged.

My product came with foreign instructions. What should I do?

Unfortunately and sometimes awesomely, some of the products we sell do not include English-language or US-specific instructions. The type of user instructions included with a product is determined solely by the manufacturer and is out of our control. In such cases, we do our best to provide supplemental information about the product in question. If you would like additional instructions or installation support, please contact our customer service department for assistance.


JST Performance is the sole owner of consumer information collected through this website. We do not and will not sell or rent this information to any outside parties under any circumstances. We collect information from you, our customers, solely to process orders and provide you with pertinent information such as order confirmations and order status updates. Information collected on our Site includes but is not limited to your name, email address, billing and shipping addresses, telephone number(s), and payment information such as your credit card number. 

Legal Statement

PLEASE READ CAREFULLY   Below is the limited liability statement that governs the relationship between you, the customer, and JST Performance, LLC when using our online tools. Please read carefully. 

ALL parts and services are sold for OFF ROAD, RACE-ONLY ground vehicle use only. Aftermarket calibrations and systems interacting with engine function are not for use on pollution controlled vehicles. Alteration of emission related components constitutes tampering under most local emission regulation guidelines and can lead to fines and penalties. JST Performance, LLC is not responsible for any fines, injuries, costs, or damages incurred as a result of the use of these services and tools. It is the complete responsibility of the customer to ensure their vehicle is operating in a safe and lawful manner, respecting all local laws and regulations. JST Performance, LLC does not offer or imply any warranty or guarantee for the results or outcome of the calibrations developed using these tools.