Do you mean a MBC (manual boost controller)?

If so, then yes, as it bypasses the whole BCS's plumbing anyway.

 

when using a 2 port solenoid...

VF24 and 28 that came on V4-6 sti uses a 0.8mm restrictor.
VF35 on newage Sti is 0.9mm
TD04 is 1.2mm.

Not sure on PPP restrictor, I think it's 1mm though.

1mm restrictor works best in most cases, the 0.8 can lead to some overboost, 0.9mm standard setup on a v8 sti is fine and best left alone. From new, VF turbos come with the pipe and restrictor pill supplied.

 

Cheers Pavlo

Top information as per usual

Dean

 

This would kind of work, but to be honest I would go down the Mig Welding tip route. The brass retrictor pill is just that of a Mig welding tip. These available everywhere, ie B&Q, Engineer work shops etc. Grab a few sizes and if you have a boost gauge go out for a run untill you hit the boost that you ought to be running at.