It depends on what kind of sound you want. I started off with TDX 12" with Berk. The sound is sick. I still have the video on Youtube. There is some rasp given enough throttle. the 2-3k drone gets pretty loud. On a cold start, it rattles the garage door and office windows. With S-Mode, people kept thinking I wanted to race them.
As much as I liked the sound, I did not enjoy the rasp and tiresome LOUD drone so I went back to stock cats and love it. The rasp was gone, and the loudness was much more bearable. I could actually listen to music on the road.
Now I have the turbos and F.I. HFC. No joke... no rasp! Sound is smoother and deeper, and probably attenuated by the turbos. Overall quieter, but it sounds so good! It must be heard in person! I also made a Youtube video showinf before and after differences.
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