I just bought an 87' pickup with a 22rte ct-26 turbo and some all stuff done to it. but the truck doesnt have a boost controller and right now it pushing about 15 psi which I know is too much on the stock ECU. So If I get a boost controller can I bring it down to about 9psi? I was under the impression that you could fool the wastegate to go higher but I dont know if you can lower it. Do I need a new spring?