Again you are soo wrong, you can add a boost controller to just about any factory turbo car and be ok within reason. For instance, putting a boost controller on an Evo or SRT or WRX that comes with about 12-14psi, can easily be turned up to about 18psi without a tune. Considering factory tunes are soo rich anyways, you would be doing yourself a favor turning it up.
God I would never let you touch/tune my car!