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Customer Service FAQs


Most items/orders over $200 have free shipping, unless otherwise noted so by management, within the continental United States.  Items shipping to an APO address may have additional shipping fees added after the transaction has been processed (a sales representative may contact you to verify whether you will need to pay additional shipping). Even though some items may have shipping charges, they may still be eligible for discounted shipping rates. We reserve the right, dependent on the individual item, to charge for shipping outside of the lower 48 states, including to Hawaii, Alaska and Puerto Rico.  All items are shipped by Ground shipping or through the US Postal Service.  Certain items may be dropshipped from our suppliers direct to the consumer.  If you have any questions or special requests for shipping, please contact us. Expedited orders do not qualify for free shipping, they may still be eligible for discounted shipping rates.

We also ask you to be aware that the United States Postal Service has placed size restrictions on shipments sent to postal boxes. You will be held liable for all freight charges and fees associated with the shipment if your package is deemed undeliverable by a carrier that cannot deliver parcels to your postal box. 

Most of our items are shipped 2 Day UPS Ground. JST Performance reserves the right to change the shipping method for any reason if they deem necessary for the item being shipped. The time it takes for your order to be delivered primarily depends on the shipping carrier and the service level selected. Most carriers do not work on weekends or major holidays, so please take that into account . Business days are defined as Monday through Friday, with the exception of holidays observed by the parcel carrier selected. For specific delivery estimates, you can usually find detailed information on the carrier's website. 


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. 

Product Warranty

JST Performance does not offer any type of warranty coverage for defective products. However, the majority of the products available through our website are covered separately under a manufacturer's warranty. If you recently purchased a product from us and are concerned about the fitment or performance of your item, please contact us at If you wish, you may also contact the manufacturer directly for information regarding product eligibility and specific terms and conditions of warranty coverage.

Returns & Refunds

Unless otherwise noted, all items have a minimum 15% restocking fee regardless of reason for return.  The customer is responsible for all return freight charges.  Items are eligible for return for no more than 15 days after the time of receipt.  All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. Due to the dangerous and stressful nature of racing and performance vehicles, no returns will be accepted on opened, installed, or otherwise used products.

JST Performance does not offer in-store credit for returned items, and no exchanges will be made. All returns and replacement shipments will be treated as separate transactions.

JST Performance ProTunes are non-tangible irrevocable goods, and therefore we do not issue refunds once the tuning process has started. The purchase can only be canceled prior to submitting vehicle specific information. Once the Tuning Information has been submitted, the purchase is finalized. Custom Tune purchases are finalized once the first map is sent to the customer, the transaction is considered non-refundable. It is the responsibility of the customer to carry out the custom tuning process until the finalized product.

Price Matching

JST Performance has access to many items at reasonable cost. The advertised prices for our items are determined by the manufacturers that provide them. If the customer can find a lower advertised price, we can make no guarantees that our price will beat anyone else's, but are willing to work with our customers to see what we can do, Part numbers must be an exact match for us to price match. Please contact us at if you wish to obtain a price matching quote.

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.