I have a the bae turbo and twin island turbo. Both are quite a bit faster then my stock deloreans. Both can be a bolt on kit but if you want to run more then 5-6 lbs you should have the motor built to handle the boost. Both mine were done buy the previous owners. So as price I can not tell you but well worth doing. The twin turbo is two small turbos with little lag. The bae is one turbo with some lag time. There is not a huge difference between the two.