Queens94z28

I currently have RK Sport mids on my car with a random tech cat. I was going to have an off road pipe fabricated to get rid of the cat but now I am considering Kooks long tubes.

Do you think the potential gain is worth the cost? What type of gain do you think I would see.

Also, if I get rid of the cat with my current set up do you think I will see a gain?

Thanks!