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Tuning Developments Uprated Performance Drop In Valve Spring Set for all Toyota Supra/Aristo Twin Turbo 2JZGTE Engines. More New product launch’s from Tuning Developments, we have been working for over 18months on a new range of valve train products to fit the 2JZGTE Engines, and after testing these products for so long, they are now available. Tuning Developments Performance Valve Spring Kits use a single spring setup with the optimum base spring pressure to suit the 2JZGTE Cylinder Head, they have been custom developed for Tuning Developments ONLY and are one of the best drop in valve spring sets on the market today. Standard valve springs are common to show signs of valve bounce/weakness once running above standard rev limit when running bigger turbocharger setups with high boost pressures or when running high RPMs consistantly, we strongly recommend these Performance Uprated Valve Spring Kits for anyone building a Forged Engine or looking to have one built as these ensure perfect performance no matter what RPM the engine is running. Toyota Supra Twin Turbo JZA80 2JZGTE. Toyota Aristo Twin Turbo 2JZGTE. All orders are processed Monday – Friday 09:00am – 18:00pm. Orders placed outside of this time will be processed at the earliest opportunity available. We pride ourselves on 5 star feedback, if you cannot leave us 5 stars then please do get in contact with us to resolve any issues. All items come with an invoice showing VAT.