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hi

hi they should work on the 90s or at least an early one as the boost is not computer controlled and if u look on some remap sites they state on the 90s u need one for a good map and deffo for a stage 2 as there not computer controlled
 

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These things just mess with signals going to the ECU, hardly recommended, you risk throwing faults if the boost parameters are outside the range the car expects.
 

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These things just mess with signals going to the ECU, hardly recommended, you risk throwing faults if the boost parameters are outside the range the car expects.
There is no ecu control of turbo on 90 so these do affect signals.

This valve just bleeds off some boost pressure from the actuator to make waste gate operate at a higher boost pressure
 
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