Depends on the boltons...
We made 459rwhp on my friend's Lumina SS (G8) 6.0 L98 with M6 trans.
CAI , 1.3/4 headers ORX , 3'inch catback , Pulley.
85f weather 91octane.
With same mods on 2010 LS3 Camaro 1.7/8 headers 482rwhp 439rwtq
The car is awesome