SuperTech High Performance Valve Spring Kit, BMW N20 / N26 Valve Spring Kit Supertech valve spring kits for BMW N20 and N26 engines provide unmatched valve control and reliability for high-performance applications. Each kit includes premium valve springs, designed specifically for the N20 / N26, to meet the demands of enthusiasts and professional racers. Built from top-grade materials, Supertech valve springs offer superior spring rates and enhanced durability compared to stock components. They are meticulously engineered to prevent valve float at high RPMs, ensuring precise valve operation and consistent performance under extreme conditions. For BMW owners seeking proven reliability and superior performance, Supertech valve spring kits deliver the perfect combination of durability, control, and power potential. Installation requires the expertise of an engine builder. BMW N20 Applications: 1 Series 2011-2015 F20/F21 116i / 118i / 120i / 125i 2 Series 2014-2016 F22/F23 220i / 228i 3 Series 2012-2016 F30/F31 320i / 328i2013-2016 F34 320i / 328i GT 4 Series 2013-2016 F32/F33 420i / 428i 5 Series 2011-2017 F10/F11 520i / 528i2011-2017 F07 520i / 528i GT X1 Series 2012-2017 E84 X1 sDrive20i / xDrive20i / xDrive28i X3 Series 2012-2017 F25 X3 sDrive20i / xDrive20i / xDrive28i X4 Series 2014-2016 F26 X4 xDrive20i / xDrive28i X5 Series 2013-2014 F15 X5 xDrive25i / xDrive28i Z Series 2011-2016 E89 Z4 sDrive20i / sDrive28i BMW N26 Applications: 3 Series 2013-2016 F30/F31 320i / 328i / 328i xDrive2014-2016 F34 328i / 328i xDrive GT 4 Series 2014-2016 F32/F33 428i / 428i xDrive2014-2016 F36 428i / 428i xDrive Gran Coupe 5 Series 2012-2016 F10 528i / 528i xDrive X1 Series 2013-2015 E84 X1 xDrive28i X3 Series 2013-2017 F25 X3 xDrive28i