I have the FI CBE with ERZ HFCs and when I just had the FI CBE there was some drone but the sound was awesome and I got comments about it all the time. Then I put the ERZ HFCs on and the exhaust got louder and the drone got worse. Now I hear the some rattle from the HFCs and is bugging me so I will be taking them off and going back to stock cats. The FI CBE by itself sounds great and I can put up with the small amount of drone from it. I just think the ERZ cats are too thin and they dont hide the noise much but they do flow good so if you want every inch of power then they are good. So stock cats for me, I have to look closely at them to make sure they werent damaged when they were taken off.
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2010 LS3 C6 Silver coupe corvette
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