porsche project WI setup?

[turbospeedster]

Hello, I'm new to the forum. I would appreciated some advise on WI for a porsche 996 engine running 11.5 comp and 5-6 lbs boost
With an AEM ECU It seems to knock a little at max boost and 3-4000 rpm. At 6lbs the timing is 15 btdc, where normal timing
would be 26-28 at 0 lbs. I don't know how much water/meth to inject? was planning to use a 2S or maybe 2C system.
with these setting, I did a couple of dyno runs and was getting 350 hp at 6000 rpm with 11.5 AFR
If I was smarter, I could calculate fuel delivery. but I was hoping for a starting point.

Thanks, I know there are several questions in there.