hi everyone.
my car is at mikeanics in cheshire for a set up on the dyno.
Got the call today to say that my engine is healthy and running well but the boost is tailing off at 5000 rpm.
The car made 170 bhp but would do more if it wasnt for the boost issue.
Has anyone got any ideas on what the problem could be ??????

my engine spec....
new hybrid turbo
new -31 actuator
msd chip
grs front mount
ported & polished head
samco hoses
piper cam with new ford valve springs
071c plugs
exhaust & air filter
bailey dump valve

any ideas ??? please help thanks