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If it is not the AOS. (It really sounds like it is), then the cats have oil in them. First off they WILL NOT smoke and then not smoke and then smoke. Just not possiable unless new oil is in there.
If the cats had oil, it will burn out, may damage the cats because of carbon build up.
Same therory goes for the muffler. (except it will not be runied if it was full of oil).
Because it comes and goes, It is either a craked head or gasket like he said. When internal pressure builds the oil blows into the chamber and burns.
But you should look to the most likely spot. The AOS. It may not have been replaced correctly or completly.
I would take it to a dealer, let them fix the AOS, then then send the bill to the INDY shop.
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2002 S
Pedro rear stabilizer bar, CF strut braces, Maxspeed headers with 100 cell cats, Fabspeed cat bypass pipes, H&R springs with M030 setup, TRG rear links, EVO air intake, B&M Short shift kit, Raby IMS upgrade, Raby underdrive pulley
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