The car (well 1.8T engine) is really meant to run with a plumb back Diverter Valve only. I have run my Polo GTI with a BOV, and had the car go into limp mode within 500m. After putting it back to a DV, and resetting the ECU, the car ran fine again.
Just run a little experiment and put the stock DV back on, reset the ECU, and see what happens.
Just run a little experiment and put the stock DV back on, reset the ECU, and see what happens.
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