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okay, i've been looking at these turbochargers, i'm not sure, but about how much performance increse do they give? somewhere around 30-50% right? does that mean i'll be getting 413 horsepower on a 310 horspower car? (40% of 310 is 124)
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It's not that simple... It depends all on boost pressure, and if your fuel system/engine internals can handle it. If your boost is low, then you won't get much of an increase in power. OTH, if you have too much boost and not enough fuel, you'll run lean, with lower power. And god help you if your cast block windows on you.
And as for turbo lag, you'll never be rid of it completely unless you have an electrically-assisted turbo (and I don't think that it spins up to full boost without help of exhaust), or you have an anti-lag system (AKA bangbang system) installed.
Features such as air/ball bearings and variable geometry will indeed decrease lag, but as with the question whose answer is "You can't get there from here.", these only ease the lag. (BTW I'm referring to the question "If every step halves the distance between here and there, how many steps will it take to get there?".