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I think your only option, and what you're looking for, is to delete the secondary cats by installing an aftermarket mid-pipe like many have done with the Borla 6060(I think). I believe Corsa has one too.
There is a thread on this, retains warranty as secondary cats don't throw a code so no tune needed. Adds sounds, but nothing crazy and no drone has been reported yet.
Good luck!
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SOLD - 2013 1LE - Pat G Spec'd Cam, NPP with 1 7/8" Long Tube Headers with High Flow Cats, Intake w/scoop, Ported Throttle Body, and Apex 1.25" Lowering Springs.
J-Rod Built and Matt@FSP Tuned
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