Because of the fine tolerance between the piston and bore

This will give you the competitive edge

This is a bolt-on fitment for the factory turbocharger as fitted to the 1

but then the factory-designed kinematics won’t work as they are supposed to

high performing 45mm external wastegate designed specifically for endurance racing or where water cooling is not available and high thermal thresholds are required for extended periods of time

JR Wheels SL04 19x10 ET15-51 5H BLANK Matt Black CB: 72,6 JR11 Because of the fine tolerancePCD: 5x100, 5x105, 5x108, 5x110, 5x112, 5x114. 3, 5x115, 5x118, 5x120 ET: 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51