long story short.....don't expect much at all....else you'll just have your dreams shattered.... :wink:
here's the low down on the 4-banger....
at the wheels, bone stock, you can get around 100hp and 105-110 (maybe) ft/lb of torque....with some bolt ons- catback, intake, etc, you maybe able to gain 10 all around....maybe a bit more......
basically unless you get some sort of forced induction, your car'll never be as powerful or fast as the v6, which means, if you really wanted power or speed, you shoulda gotten the 6 in the first place....
and as for the engine swap....(and i think I speak for everybody here), we'll believe it when we see it....once you put your money where your mouth is, we'll give you props for the work.....
not trying to discourage you, but unless you're in some serious money, just make sure your car looks nice....they may be fast...but you'll be cruising in style.... 8)
good luck, and happy modding