Warranty info from their website
All products sold by ID-workz are only subject to the manufacturers warranty. Manufacturer warranty will not be honoured if the customers mishandling, abuse or faulty installation causes the defect. If a product is deemed faulty, the purchaser will pay for all shipping costs. ID-workz will only accept a warranty return if the purchaser supplies a receipt of installation from a licensed automotive engineer. Parts installed by a non licensed automotive engineer will render the warranty claim as void. Please note some Japanaese products carry no warranty. Forged engines have no warranty due to possible misuse, fitting and tuning by third parties. Any work carried out by third parties will be at the responsibility of the customer.