Hi Guys

My 1.8 BJX is currently having boost surge issues (I Think). When the cars all warmed up and i plant my right foot on the throttle, the boost rises and then drops off, and builds up again and drops off.
The whole time the car will still accelerate however the car does feel like this its surging forward and then back as the boost builds and drops off.

Is this the Recirculating Diverter Valve? Which I believe is the original, Or the N75 Valve. (52000 miles on the car)

Cheers
RamJam