I read on the LS1 page that a guy had installed LS7 exhaust manifolds on his LS6/Z06 corvette (or maybe it was a CTS-V, I'm not sure). He said he dynoed before and after and picked up 15rwhp just by making the switch from the factory LS6 manifold to the factory LS7 manifold. I presume the bigger diameter exhaust manifold of the LS7 accounts for the power pick-up/better breathing. Anyway, assuming this is basically doable, does anyone know of anyone who has done this performance mod on their 2004-07 CTS-V? I'm prepared to pick up some used LS7 stock manifolds and have a muffler shop fabricate/attach these to my Random Technology high flow cats if the LS7 manifolds do indeed attach to my LS6 heads. Anyone know? Please advise.