This is a 2 inch correction and 1 inch differential correction that will keep stock tank. Though the tank fit is tight and will need some work to get a good smooth install. These frames are even lighter than our standard frames and are 100% Docol construction. If you are going low for a road race or time attack car this is the kit for you! We can build this kit in poly mount or com bearing solid mounts, also can combo with extra chassis mount for really high HP cars that do hard launching or clutching. This kit only come with the rear frame.