Very good point.

It is like saying should I chg to lowered springs when my shocks are worn.

In the case of aging radiators, yes technically you are right.

The cooling system is a very vital part of the car, if your radiator is so old that it cannot handle .2 bar of pressure over standard, the radiator should be serviced or changed.

Preventive maintenance of the radiator should always be done especially on a high performance car.

As iterated above, by raising the pressure in the radiator, boiling pt is decreased. Running lower temps on a turbo-charged car extends both the performance and longetiivity of the engine.

I would rather replace my radiator than my engine.

Thanks for the comment, will have to post some good performance radiators up within the week.