5000 is a bit on the high side. Hell, a GT42R would spool around 5,000.
My friend has a 60-1 on his SRT-4....8.1:1 compression and he reaches full boost at 4000. As soon as he gets rid of the shitty stock exhaust and gets a 3" turboback he'll have full boost at 3500-3600. Yes, thats on a 2.4 liter but its lower compression so it should be about the same.