been a long time since I used one in a buick but I have a greddy profec b in my eclipse and it spools fast with low/ high boost setting that are both adjustable and a balence control. give you 4 pis of adjustment at each setting so you turn you wastegate lose to about 12 psi setting this would be you base low boost or contoller off setting low would be from 1-16 psi and high would be from 16-20 that are about 250.00