How does the baffle look like? There are often two versions, one that is just a more narrow end pipe and the other that is almost closed with just a few holes in it.

Here is a picture of my two different versions, yours could be similiar.



The one on the right is the worst kind, it makes the bike run bad and some times even worse than the original silencers (in worst case scenario it will burn away all insulation in the silencer because of the heat build up).
The one on the left is just a pipe with a smaller diameter but it actually reduces the sound level by several decibels. And it does not hinder performance in a big way.