How much louder will it be with longtubes on the highway?

Thought I'd update this post, and tell you my impressions:

I went from :

Stock manifolds + Bassani X-pipe to

to:

BBK longtubes + BBK catted X-pipe

I was very surprised that I could barely tell the difference -even at WOT.

Now, if I could just figure out why I lost power...
 
Wow when I switched to my long tubes I was very surprised in the power gain. This was the only mod I've ever acrually felt a difference with, besides gears, it was such a difference that the car actually ran like crap for a minute or two before the computer caught up and compensated for the increase. Somethign must be wrong if your losing power....