Having been around these things since the early BA's, I have some experience with quite a few different coolers on the T and F6. Most of the things here I agree with. That is: - rising intake temps will reduce timing and rob power - the cooler is a heat sink and therefore a bigger one will keep temps down a little longer than a smaller one (ignoring flow for the moment) - the Monza unit is cheap and you get what you pay for. However, I ran the original prototype with a different core for a year or so on the BA T. The car ran over 300RWKW. It would have run more with a better unit, BUT, ran a sh!tload more with it than with the stock BA cooler. It is bigger and it had better flow. Would I put it on a car today? Probably not. But I'm a little older and the extra folding for a better setup is not as hard to find. On a limited budget and power expectations though, it is a better option than running the stock BA unit.