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Lol invidias are more expensive than the berks. And by far less restrictive. I think they are the least restrictive. 200 cel. Kinetix (which I had before I got test pipes) 250 cel and berk 300 cel.
If you have the right tools, you can DIY. But I'm glad I brought it to a shop that had experience with HFCs. The issue with my car was that the top bolts on both the stock cats weren't cooperating and became stuck. One of them happened to snap in half, while the other bolt had to be cut off using a tool. Some people had no issues getting the bolts off, while others (like me) had tons of issues with them