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CAT designs of today cost very little to performance over the old brick types of years ago.
EPA being they make the nameplates warranty CATs for 8 years state being they are replaced for free to the car owner that only OEM CAT be used.
Most so called high flow CATs do nothing for performance and in many cases go bad in much shorter timeframe then the stock OEMs.
I see them all the time that get plugged up and effect AFR left/right banks.
Vendors like to sell them for the profit but if maintaining CATs for legal purposes then stick with the stock ones.
Some are ill designed and cause O2 Sensor tests to fail causing DTC error codes.
Being the PCM monitors the CAT temps it is better to use stock ones that maintain the proper heat range the PCM monitors for. Incorrect CAT temp can cause PCM to switch into Cat Over Temp (COT) and dump excess fuel in to cool the CATs to prevent CAT failures and ruin proper AFR for power enrichment or WOT.
Consider Corvette C6 Z06 or even ZR1 with 640 HP uses stock CATs so they are not delimiting the performance.
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