catch cans

do i need oil catch cans for the gt2 and jb4 tuner? do i need 1 or 2 oil catch cans? denso spark plugs or hks spark plugs? do i need to buy a chip to go with the jb4 tuner? which chip to buy? i did a muffler delete and purchased the jb4 tuner/bluetooth

A close call for me... as I was almost convinced this was necessary. If you want another opinion, I suggest you watch “the truth about oil catch cans; should you fit one to your car” hosted by Autoexpert.com John Cadogan on YouTube. Afterwards, you may find it fun to watch his review on the Kia...