Old big housing Tial Style Wastegate Springs 8.7psi

All external wastegates have a wastegate spring inside them set at a certain psi rating which means the wastegate cannot let more psi in and go pass the springs pressure rating. If you are wanting to increase the boost in your vehicle the most stable way to do it is to replace the spring with a high psi rated spring. Of course this works in reverse if you are wanting to lower your boost. This is the best way to control your boost in your vehicle as it is stable.

*8.7psi spring for Tial Style Wastegates
*40mm Inside diameter/ 85mm spring height
* Wastegate springs pressure ratings are the max boost the spring will run it might hold at slightly lower than whats listed!