^^^ Yes sorry for that.

^^^
Anyway, as far as timing that will not be a problem. First off, the ECU can pull or put in timing (but I KNOW, it can only do it to a certain degree). Now, a way to help with the timing (and add hp) is to add water injection.
Not only will it "appear" to raise the octane rating, but it will also contribute to colder egt's (exhaust gas temps), less fuel being added, and timing will not have to be pulled out as much (this is why this yields to more hp as well as a safer mixture).
Not only this, but water injection can also be used with tuning. If the air/fuel is to rich (lets say, 13:1 instead of the optimal 12.5:1) Then you could add a little more water and the a/f ratio will decrease.
I will start this project soon as I already ordered the turbo (a t3/t4 that will be mounted STS style).
I will keep you posted!
Tito @ TR