The Corsa seems to be the trick. I would do either an Archer Header of a Belanger, as they are the two that seem to be putting out the power. I can affirm that my Archer Header with a Borla catback will peel paint off the walls. Is it annoying at highway speeds? Yup, yup, and he#@ yes! I much prefer the Corsa set-up that we have done with two customer's cars of late. Both had Belanger headers and they are raucous under power, but very liveable on the highway. We did a Archer sytem with a Corsa about
5 months ago, and the customer was happy with it. The key to livability appears to be the Corsa.
PS- Actually with ear plugs and a helmet on, mine isn't too bad!