I have the Hookers shown above. Know that they are a huge pain to install. (not to mention to remove them which is even worse when corroded)
They are in 3 pieces each. the cyl 3,4 bank 1 and 7,8 bank 2 are tubes that needs be inserted while rotating a bit inside the rest of the tube from the front cylinders going under the crossmember. If you are lucky to have access to a lift it should be a bit more easy, and having a second pair of hands would also be welcome.
If only they had made the tubes going down straight by cutting them higher, you could bolt the rear ones a bit and then push up the rest in/up. but no, they choose to make the 2 loose pipes at different angles, forcing you to rotate/move/tap/scream/swear while busy. They are that expensive prolly because of the fun times that comes with them.