Most things called "baffles" really aren't and they do pretty much nothing.
In order to achieve any reduction in the noise, the exhaust pulses must be slowed down and stretched out.
To do that, you need to block the direct path out the end and make the exhaust take a longer and larger route.
You don't want to actually restrict the flow (much), just re-route it.
If what you have really are straight slim pipes, that's really hard to do.