Thanks, well I think the stock manifold is ok for 1bar and i'm running 1.2bar on standard mani at the minute
Thats because you're foolish how did you get 170+ rep saying stuff like that.
This thread is a mess of advice imo.
First thing i will say don't touch the car and get in contact with you local CAB office for some decent advice about sorting out your money and transaction with the tuner.
Once the people at the CAB office have told you it's ok to start sorting the car you'll need too.
Turn down your boost i would go right back down to standard and work from there.
Now 1.5bar will not do anything to you pistons on a ct9 if the fueling is correct, but seing as this guy didn't seem to know what he was doing the fueling could have been out, so compression test it to find out.
You shouldn't run more than 0.8bar on a standard mani. Ignore people that say "i've been running 1bar for xx months/years and not had any problems". The problem is the restriction in it causes heat to build up in no.3, it will run hotter and burn your piston rings. The problem come with people think that you turn it up to 1bar it doesn't go bang straight away it must be ok. The truth is it can take years to start being a problem when no.3 has low compression.
Now i would say your turbo is knackered sounds like turning it up 1.5bar killed it. The jump in boost is probably the bearing are broked. As adviced a second hand unit is your best bet or rebuild or hybrid depending on £££.
Sounds like alot of the stuff is right on the car and will just than need setting up propery with all the correct supporting mods.