Well after doing a few more bits to my car upgrading bits etc I have now lost 11hp lee at devil developments said I was running very lean high up alot leaner then before and my fuel pump was probably on its way.

The strange thing is the car feels alot faster than before and deffo pulls harder.

Other then running lean the boost is turned right down to 8 psi now to prevent any damage.

Could the temperature cause that much hp loss? It was 26ish on the car and about 14 on the car temp last time.
He also said the standard intercooler was probably no good either.

Thoughts please I've ran on his dyno twice and jkm which read 320bhp, his first was 301 and now 289 jkm was straight after the turbo install and was obviously a nicer result but not reliable and should of stuck it on devils again.

I have it booked in to have The omex standalone management installed and remapped.

So my route now is
Headwork
Lightened flywheel
Management
Better exhaust manifold
St gearbox
Larger intercooler I was always lead to believe the standard one was a good setup?

Any way essay over and yes I am very disappointed lol