boost leak + rough idle
 

I've installed my downpipe and midpipe.
I've removed my airpump.
do i have to put a plug to the hole behind the airpump?
do i have to put a plug to the hole where is the brown thing (like the blow off valve i think it's the air bypass valve)
do i have to adjust my idle? where?

i also have a rough idle going up and down.....
when i accelerate my first turbo goes to 10psi and go a little up and down.....
when i get to 4500rpm the 2 turbo my boost go down to 4-5 psi and when i release the gaz my car do a cow sound????


anybody can help me????

hahaha...a cow sound