Well there is work being done with bolting up LS6 Intakes so far as it bolting up in not to worried. More of the hood clearance issue. But think a LS6 intake should get us 15hp better. Thats just a quess as that is what alot of F body guys saw when they swapped there LS1 intakes for LS6 ones. And that website clamed another what 20hp. Of course that was with some other work to the motor. But this intake solves alot of the issues of installing a LS6 manifold into our cars, from the look of it. Would have to buy and try it of course. Some of the problems of swapping intakes making room for the Opening in the intake track because we have an oil presure sensor built into the top Valley section of the motor off the DOD which is causing the restriction of our intakes in the first place. THen u have to modify the connector for the DOD. SO if this opened up room like it looks like it would. that would eliminate alot of the work modifiing . Then just get a nice big cowl/Shaker hood for clearance. Maybe even the Inferno Hood might clear it dont know though. As i have never seen one in person.
http://www.pfyc.com/pc/GP1901/04EXT/...+Air+Hood.html <------Link to the inferno hood.