I retrofitted mine with TORs and ran it for a few days without the TORs tune (i.e. TORs with the tune for stock factory exhaust). Like this the TOR mufflers did way more popping on overrun than there had been with stock mufflers (they had done a little popping on overrun, but not so much).
After getting the TORs tune into the ECU the popping on overrun became less than original stock mufflers had done - it pretty much disappeared. Lovely sound on overrun too, to my ears.
This was 2008 so was 20193 stock tune vs 20194 TORs tune at the time I think.
But has been updated at service since.
Cheers,
BB