Hello what you say about this MagnaFlow sport cat for normal road use? I have only decat pipe and its not good solution.
How about emission check testing with this?
And why they offer sportcats with differently diameter for same type car?

https://www.ebay.com/itm/Magnaflow-2...YAAOSwQYZW0MfB

https://www.ebay.com/itm/Magnaflow-2...cAAOSwll1W0MSb

Its good choice buy this? And if yes, which one?
I need catalysator for emissions check, but original cost around 1000£ :-/

Thanks