Alright so my ko3 on a unitronics stage 1+ was spiking around 17psi and it seems to have dropped down to 15psi in the lower gears??? there is also what seems to be a slight grinding/rattling noise when hitting peek boost. this all happened today, not sure if its an actually problem seeing that the car is running just fine and I cant really even notice the 2psi loss in the lower gears.

car has 100,000k and a 007DV.

any insight would be great.