CBE worth the money if you already have HFC's?

UFreefer

I've been doing alot of reading and research and the consensus seems to be:

The first exhaust mod you do will result the most gains, and then thereafter the exhaust mods will only net a few more hp

If the first exhaust mod whether it be HFC's or CBE will result in the biggest gain, and assuming you don't care about asthetics, is it worth even installing the CBE on after the HFC's?

I know it's worth it to some, who have money burning in their pockets but if HFC's will give you 15-18hp for $330, is a $1500 CBE worth it for 5 more HP when the HFC's on a stock exhaust sounds pretty good and is quieter then HFC's with CBE?

I know there will be varying opinions but wanted to get people's thoughts.