yes i have been thinking about this to but on a 30/26, i think to get the most out of them you/i would need to spend $50,000 to get the car to move and another $50,000 to get a car to the point were you can drive it, even then i think it would be a pig of a thing on the street and would just be a expensive dick swinging exercise.
i think you should sell them (you get $1200/$1500 for them each) and get -5's, they will be all the turbo you need and the car would be alot nicer to drive but it would still be scary to drive to.
btw -5's cost $2000/2500 so if you sell the 2835's you can afford them ezy.