Stiffer Valve Springs with Retainers for 1.4 TSI EA211Upgraded valve springs, 30% stiffer compared to stock for 1. 4 TSI EA211. Bolt on fitment without any modifications. Set including 16 valve springs. Set including 16 retainers. As is well known, car manufacturers design turbocharged engines with low boost pressures in the range of 0. 50. 8 bar, aiming for low fuel consumption. However, during the tuning of the EA211 engine and with turbo pressure exceeding factory specifications, the stock valve