Australian Holden Commodores use these engines, in RWD form, and also have
for a few years.  There are two versions offered, both 3.6, with 180 or 195
KW, the more powerful version has variable valve timing on  both inlet &
exhaust, while the base model just has variable inlet timing. The Pontiac
web site specs this motor as 188KW (252Hp).   Rougly mid way between the two
Holden specs.  Feedback I have heard is that the 195KW version has a
sportier feel, and sounds better, more improvement than the numbers would
indicate.

Any idea which motor the G6 is using? The 195KW version with a crappy
exhaust & stricter emission requirements, or the 180KW with a better exhaust
& tweaked a little?

Either way, IMHO it's as much HP as you would want to put to the ground
through the front wheels on a car that size.

The Australian Commodores are bigger & RWD.

Then what will happen to the 3.9?...not that I would miss it...I thought it
was a big lug anyway...almost 4 litres and bearily putting out 250hp, and
only putting out 227hp in the G6 convertible. I  say good riddance if they
are all replaced with the 3.6. Smaller more compact, better gas mileage and
more powerful. If pontiac gets around to to putting one in the G6 GTP
convertible I may very well get one. I can't tolerate only 227 measly horses
out of a big 3.9.