MSP Exhaust parts.(NOT the manifold, mines good!)

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2003 MSP
So I've rebuilt my MPS real solid. Seals, gaskets, sensors. All available factory stuff. Some stuff isn't available from the factory. Most of the exhaust system was replaced with standard Protege plumbing. Like the muffler. The cats may have been replaced with regular protege cats. I gotta recheck the repair/parts list. My main concern is will standard protege cats and muffler have a harmful effect on the engine, like too much back pressure blowing gaskets/seals? It's nice and quiet and pulls pretty strong and all, I'm just worried about long term issues coming up.
 
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