Hey mate, I'm looking at these. They are redback as you said you have on your SV6 and sounded good.
Holden Commodore VE Sedan Wagon SV6 SS 2 1 2 Redback Bolton Sports Mufflers | eBay
Holden Commodore VE Sedan Wagon SV6 SS 2 1 2 Redback Bolton Sports Mufflers | eBay