Hi,
resonated is supposed to give you the benefits of the catless downpipe when it comes to air flow and sound aggressiveness without the rasp.
As for catted options,
If you have a piggyback or no tune, get Fabspeed since it guarantees no CEL.
If you have a flash tune, our most popular option is Wagner Tuning since they use Euro 6 quality cats.
Another good option would be VRSF
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