Might as well throw a turbo on yours, probably way less costly than a new engine. Any v6s even out there turbod?
The only way to accomplish this, with the difficult-at-best BOSCHE ECM on the G8 V6 is what some Aussie's have done over the pond. They supecharge by "piggybacking" their add-on ECM inline with the stock ECM to modify the characteristics and commands that the ECM fires off to the engine and engine management controls "inline" to boost performance and promote a turbo setup.
This is NO EASY TASK. Plus, there are tons of wires in ECM's, and this would most certainly void any warrantees on powertrain if such a piggyback ECM (or turbo for that matter) was found.
To that end, since both the camaro and the g8 are ZETA platform cars, it's possible that the two v6 engines are able to physically be swapped. With that, you'd want to include the camaro's v6 ECM and be privy to the camaro's transmission (or keep your 5-speed manualomatic from the g8?) .... it surely would be a big task, but not impossible for those who are familiar with engine swaps. Even an aftermarket harness could be used to convert the factory car-side wiring to ANY
modern non-standard engine. How else do they fit LS1's into 1930's rat rods or 57 chevys? It's not impossible!!
If you're contemplating an engine swap anyways.... why not make your V6 g8 an LS3? As in, "go all the way". That way, you can upgrade to the 6L80e 6-speed auto found in the A6 GT or GXP, you can run the stock E38 ECM for the LS3 V8, you'd get a lot more power from such a stout engine, you'd have infinite upgrade and power-adder future options, and your "lolely v6" would be big on power when all was said and done.
In the 1980's, people took old 2.8L V6 camaro bodies, pulled the engine and trannys, and put in 350's for a "cheap performer" ....
This is similar to that, except the Suspension is superior: 1980's 3rd gen camaros that started life as a V6 would "sag" in the front end due to the increased weight of the 350 and the weakened springs on the stock v6 car. THE G8 Comes with the FE2 suspension on BOTH the v6 and v8 GT models. Yes, the G8 GXP comes with the FE3 stiffer higher performance suspension, or you could even consider aftermarket (Pedders, BMR, etc) ... but my point is, the stock suspension on a v6 g8 would be FINE to start off with.
The only remaining difference that I would see would be speedo/odometer accuracy on mileage (branded title or "mileage innaccurate" with new engine, not good) ... and the stock v6 "peg leg" rear end, where the v8 g8's have limited slip rear diffs, standard. Or switch gearing to a more stout camaro 3.45 rear end and solve both problems at once.
Nothing is impossible... but with any of the above, you'd need to scope out and check references to major engine retrofit and build shops, and get estimates, and get your sights set on what you really want. Do you want a bump of 35 horsepower and a lot of expense in a full on engine and ECM swap? Or do you want a bump of 100+ horsepower, nearly unlimited mods potential with a v8 engine option, and similar "to install, to swap" costs as the camaro v6 would have been, without the negatives that generations-past cars had to endure (soft front shocks in teh 3rd gen v6 camaro 350 swaps of yesteryear).
Sorry for the novel, just food for thought!