TialSport external wastegate springs are used to calibrate the diaphragm and set the desired pressure, or for those who prefer to manage the pressure in a stable way for practical reasons or because they do not prefer or are not able to control it electronically.
The price refers to a single spring. Please note that from 0.6 bar of pressure onwards 2 -3 -4 springs are needed, therefore it will be necessary to buy more springs based on the pressure you want to obtain, or buy the complete spring kit in the accessories section.