Hi mate, glad your 165 is coming together, power wise, I think you will be between 210 and 220, I make 255bhp at 1 bar on my hybrid, its a CT26 stage 2.
Next mods, colder grade plugs, lag you charge cooler res, and look at improving the chargecooler rad, I have bined my AC so I can now run a metro turbo rad just for charge cooler.
the other easyish power mods, straight intake, battery in boot, downpipe if you do not have one yet and if possible water injection so you can run more boost.
your big issue is going to be power loss due to heat, you will find the car is great first thing in the morning, but after getting in traffic latent heat will sap power.
Make sure you have removed your bonnet insulation, heat sheild the area over the turbo, and remove the rear rubber strip.
I had great results by venting the bonnet directly over the turbo too.
hope this helps!
