I've been told its somewhere from 10-15 psi, is this correct?anybody knows for sure?

Yes that is correct. You should be in the 10-15 PSI range.

I see, but I wanted to hear what 850 t5 owners say, maybe some of em got boost gauges and know te boost.

I got the new IPD catalog a few weeks ago. Anyway, on page 5 they list the 850 T5 as stock boost of 9.7psi. The T5R and the R both at 12psi. Thats if anyone cares. But you were both right.

There you go.

thanks

k, thanks

9.6 PSI is what I've heard..

Edit: And 10.5 for the R.