Bro, I used to kena my mid-box a lot. Then I changed to a smaller midbox and welded it higher. The catcon was taken out and replaced with a smaller lighter bullet (can buy from drexchan. He sells the midbox too). The piping shouldn't be bigger than 1.75 cuz you might start to lose back pressure.
The catcon actually has traces or uses platinum or something inside the wire mesh, that's why the shop won't return your catcon to you, they can sell it at a good price!
Anyway, just PM me if you want the catcon. We'll talk via PM
Btw, straight flow and bypassing the catcon is very very very very bad for the environment and smelling the exhaust of a car without a catcon is poisonous.