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I ran my HJS Euro 6 catted DP for over a year without a tune. No CELs or other problems. I then ran it with the Dinan piggyback in Stage 1 for 6 months and no issues. I'm now running with the Dinan piggyback in Stage 2. Again, no issues. The Dinan piggyback isn't designed specifically to run with a DP either.
The primary reason tuners recommend DPs with Stage 2 tunes and higher is because of the elevated exhaust gas temps when running higher boost/timing, etc. That heat can kill the stock cats at a quicker pace than stock. It's not because the tuners are doing something special to the tune to account for the DP to unleash more power.
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The forest was shrinking, but the Trees kept voting for the Axe, for the Axe was clever and convinced the Trees that because his handle was made of wood, he was one of them.
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