Because on the average, just opening the exhaust system will allow for more boost to be made. Besides, it sounds cool. Stage 1 calls for a target boost level maximum of 12psi . To achieve this boost level we are going to set up a two-stage boost control. Remove the hose coming out of the wastegate actuator can and plug the hose.
Test drive the car.
If you've only got 5 to 7 psi of boost, things are good. Now you have to find the restrictor. It's in the wastegate solenoid vacuum lines that you just rendered useless when you unplugged the hose from your turbo, OR it might be in a tube that comes straight out of your turbo. Cut your new rubber line in half, then reconnect it back together using the restrictor. Mount a solenoid underhood as close to your vacuum source and wastegate as possible.