Because he gots on a roll, next stop AGT. :wink2:
Unfortunately unless you having issues with your stock downpipe, a aftermarket does nothing other than lighten your wallet gives you something to do for a day and gives you bragging rights.
All the gain claims are part of the fantasies with some aftermarket stuff and lots of people that spent the $$$ wants others to do the same.
I know, I fell for the same BS on several bull chit gain claims.