think i made up my mind

first of all i have a 2010 dbl cab TRD OR. i think im going to order the OME lift kit i just had some questions.
1. what are TSB springs?
2. i noticed this kit didnt come with U bolts will i need to buy some?
3. im keeping stock wheels and tires for now. will i need wheel spacers? and will i need longer brake lines?
4. with out the spacers how high will the kit lift my truck?
i guess im just trying to figure out what hidden cost's there will be with buying this kit instead of the ultimate lift kit. and what else ill have to buy if this kit doesn't come with everything

thanks alot guys thats all i got for now any help is great

 

you wont need wheel spacers or longer brake lines. depending on what springs you got you should get from 2-3" of lift. and if it did come with something to lift the rear you will need longer U bolts