The HFC will sound better than stock but the CBE will give it the best sound out of all mods but it is also the most expensive one. Also IMO HFC will degrade somewhat quickly and start to sound raspy and you will have to replace them again or put up with the sound where the CBE wont do that. Right now the ERZ are the least expensive HFC but we are kinda waiting for a certain amount of miles on all HFCs to see how they fare over time, as if they wear out.
Now that I have finally got my ERZ HFCs on, I am actually thinking about putting the stock cats back on as I am kinda on the line about the volume and some raspyness. The FI CBE by itself sounded awesome.
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2010 LS3 C6 Silver coupe corvette
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