What kind of baffles do you currently have??
Mine are only about 4 inches long. I actually welded a washer to the front to make the exit smaller and am still tempted to wrap them to quiet it down a LITTLE bit more. If they weren't so expensive (especially having to buy 6 of them) I'd get a set of the long "quiet" baffles from cobra.
My understanding is that the Cobras came with 2 types of baffles (I may be wrong here).
If the baffles you have are longer than about 4 inches, then you should easily be able to drill them out or shorten them without problems.
Or maybe a trade can be worked out??