With twin tubro you will have around 1,000 hp or so. This will depend on the size you go with. There is room for them under the car, but to get the tubes back to the engine you will have to do some crazy stuff. You have a choice of cutting some holes or you can do some crazy plumbing with the feed back. The other way I looked into was a kit from Banks that was used on some of their boat setups. This will also need some modding of the under hood body work.
Both setup will work, but each one has something that I was not ready to do to my cars. Right now you could put any of my big blocks back to stock without spending hours repairing the bodys. There is no cutting done on my setups at all. Rich