DNA will not accept any return without prior written authorization. All returns must be shipped PREPAID to our warehouse and must include purchase date, invoice number and a RMA number. We only accept goods returned within 30 days of purchase. If products are found to be misused, modified, improper installation or damaged by dealer or end user, DNA has the right to return the product to the dealer at their or end users expense. All warranties are non-transferable, limited to or through original retail purchaser only. DNA is not responsible for incidental or consequential damages by dealers or the end user.