for me... not a clear choice.
I would say Forge but not sure the pipework is going to flow well enough for >300bhp power level unless Forge know of an IHI ibiza running with theirs.
 
i think my mates running the forge fmic on ihi and hes running 342bhp at jabba 2 weeks ago but if i want 350+ will it be good enough? wot are you running bill
 
dunno about forge one without seeing pressure loss acoss the core on the runs.

Depends how hard the turbo was having to pump to get the 340bhp level.
You would need to ask Jabba what they thought of it.
 
Mine is forge and has seen 362bhp on jabbas new rollers ,1-2psi pressure drop.
Dunno if it is the same as the beezer core.