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TST has a 30 day money back guarantee on all Power Kits and PowerMax Computers in like new condition. Used thermocouples or sending units used with any of the PowerMax units are non-refundable and will be deducted from original amount.  All wiring used with PowerMax units are subject to a restocking fee or possibly non-refundable depending on condition.  All other products, such as gauges, injectors, turbine housings, etc., may be returned within 30 days, only if they are unused and in the original packaging. Service tools are non-refundable. All returned items are subject to a 15% restocking fee.  TST is not responsible for items lost or damaged in returned shipping to us. It is recommended to keep tracking #’s on returned items. When sending items back, make sure they are properly packaged.  TST will deduct the cost of shipping package to you from credit.  Extra shipping charges are also non-refundable.