Actually, when getting the max power out of a N/A small block for example, more power is often mafe with a carb, from some of the stuff I've seen. That's a maybe! Forced induction, at lower boost levels, such as in a stock application, is just as relaible as N/A. When done right, forced induction is pretty much the same as increasing displacement. Again I say, the problems arise when people increse boost levels too much, which raises cylinder pressures, and breaks piston ring lands. We have a WRX STI at the shop that's a victim of this, along with the turbo having come apart. Side note: I was surprised to find out that the Syclone (turbo 4.3) engines use cast pistons. I've had to replace one. Actually, I think many stock forced induction engines have cast pistons.