[nitrorocket]

Cam pretty much summed it up!

Also. You MUST run a Wategate, you do not have a choice here. Every turbo system has one, you just may have been hidden in the systems you have seen. some are built right into the turbo.
For your car, the BIGGER the wastegate, the LOWER you can turn the boost down. If the turbos are sized properly, and you have a large enough wastegate, you can just about turn the boost OFF.
The wastegate bypasses exhaust around the turbo. The more open the wastegate is, the less exhaust actually goes through the turbo to spin the turbo, the less max boost you have. You cannot go to large on the wastegates for a street car.

A BOV will drastically increase the life of your turbo. You will eventually tear the bearings out of the turbo without a BOV.

Good luck, Both Cam and I have good experience with turbos, so feel free to post away!