use mac type ones they are the same..or just go onto ebay and type in boost solenoid..plenty there and ye will pick up a mac one for about 49 quid..AND they work,googlem them and you'll see they're a seriously good bit of kit,aem use them in conjuction with there ecu's.. apexi's are seriously over priced..imho.
i have a forged ep82,running 250 bhp @1.3bar on a td04,has wilwoods,quaiffe diff,power f.c,460 injectors,orc309 clutch,hks super silent stainless steel exhaust,etci may sell if the price is right.
i agree withj rubix cube...albeit i'm running a power fc. as well,the cost of getting a new standalone in and mapped is seriuos money compared to a plug and play power f.c.,and frazer shop about bud you don't really need the hand commander although it is handy,if people are building there cars with a limited budget,then i think they're the way to go.
there were different levels of the gsr..the 260 being the entry level or poverty spec they tend to go for less money,but are the same engines,but obvoiulsy in a more 'de-tuned' state..