09 GT with SLP long tube headers. Last year I had a rattling sound under moderate to high throttle. Turned out to be the catalytic converter monoliths were disintegrating. I bought replacement catalytic converters and installed a Borla catback system, and got a tune as SLP recommended (they said the cats disintegrated because of the lack of a tune, "running rich"). I ended up getting a tune from PatG, and everything has been great- as all say, it really woke the car up!
The issue is, the rattling sound is starting again, less than 11 months later. PatG says everything looks good with the tune, so I'm pretty certain it's due to a problem with the SLP cats. I would like to replace them with something other than the SLP cats. Does anyone else have SLP long tube headers with non-SLP cats? Anyone else have this rattling issue? If so, what did you use? It seems most of the cats available are like the OEM cats and have a bent pipe as part of their design... the SLP cats are just straight and clamp on. I'd like to replace these and get back to enjoying the car!
Going cat-less is not an option for me.
P.S. If anyone has the dimensions of the SLP cats, that would be useful as well! (No lift/ jacks, so measuring would be difficult).