Have been experiencing intermittent overboost problems before and after modifications.

Have been told that there is restrictors that can be changed/adjusted to increase or decrease boost.

Any suggestions please?

MY97 GpA Downpipe
Scoobysport BB
ITG panel filter
Resonator removed
EVO DV
wastegate pipes recently removed and cleaned.

 

Have you tried cleaning your Boost Control Solenoid - these can apparently get contaminated with oil if your levels are too high.

Brake cleaner spray blown through the vacuum pipe into the solenoid and then a quick drive before it evaporates is reported to solve the problem.

Can't hurt anyway...