because the 4" kit also spaces the strut downward. when the strut is spaced downward, the lever action of the a-arm allows the extra 1" of downtravel to translate to around 2" while only hindering uptravel by about a 1/2". it's all in the placement of the strut travel. now, this measurement also includes trimming the front bumpstops from about 1-1/4" down to about 1/2-3/4" and disconnecting the sway-bar.

now, with a 2" lift, one would not alter the stock spacing of the strut and would therefore retain stock travel numbers, not hindering or lengthening it. due to the new spring rates, it may take more pressure to compress the spring completely, but the available travel is still there.

the main increase in any suspension alterations made will be in the rear. with either a 2" or 4" kit, one should also include longer rear shocks and as such, will immediately add travel to the rear suspension, albeit, altering the arc of that travel, yet still increasing it. also, with my rear shock relocation kit, one could expect to at least double the amount of suspension travel available from the rear suspension.

in any IFS system, when equipped with a straight rear axle, one can expect that the IFS will always end up with less travel than the rear and that the rear will be easier to create more travel with minimal mods.

and just for your information, neither the 2" nor 4" kit raises the COG enough to be worried about in terms of road stability. i ran the 4" of lift with no sway-bar for 3 years, 2 of those years being the 4" kit i now sell. i also ran my rear shock relocation kit for those 2 years and even though they mount in an "A" shape above the rear axle, the body roll was not significantly increased to such a point i thought i should need my sway-bar back on. unless you take corners at 50+ mph, you shouldn't be worried about body roll much.

one last thing- you can't cut the fenders enough to run a 32" tire with no rubbing on only 2" of suspension lift, believe me, i ran this set-up. the rear fenderwells will have to be cut so much that you'll cut into the cargo area of the passenger compartment and the firewall in front is just too damn close to the tires, not to mention, the turn signal placement. a 31" tire may be ok, and i know a 30" tire is fine with no lift as long as you run stock rims, but even they still rub up inside the fenders a bit.