Try calling JBA direct for assistance. Maybe you can get some cutsheets of their catback that you can compare to your current set up.
Haven't read of too many people getting the JBA catbacks around here... its a variety of other great sounding ones, like Magnaflow, Corsa, Flowmaster etc... muffler delete sounds great also on the LS3 and once you disable AFM on the L99.
I've got JBA's high flow cats and they're very well made, sound great, and is one of the best mods on this ride, next to my headers... lol, literally and figuratively speaking...
Would love to hear how they sound once you get them installed if you do go this route...
