what modifications will the dealership do and still warrenty the car?

im wondering about a couple things that i may have to do to the vehicle, but if they will void my warrenty, im wondering if the dealership will do them instead, specificly, moving the seat back a few inches.

the dealership will add whatever you want, but I can tell you that everything I have listed on my modds has not voided my warranty. And the dealership has not voided my warranty, because they know better :D

the dealership will add whatever you wantD

so i can have them add a supercharger, header, and move the seat back before i even get it?

Yes they can. But, if something breaks and it's related to the part that was installed and it's not an OEM/TRD part than they can refuse to cover that under the warrenty. So if your s/c blows the engine you're up ____ creek. Unless it's a TRD and installed by them.

will they install all of this stuff before i take delivery of the vehicle? more to the point, can it be included in the final price of the car, or will it have to be purchased later on

Yes they can include it in the final price of the car if you are having them install it. Granted it will cost you an arma and a leg since 99.99999% of dealerships charge an ___ load for labor and time. Be cheaper to do it yourself or find someone around you to do it for a pizza.