[Weller]

No, there's no supercharger on the G6 GTP Coupe, or any G6.
Yes, there is a company that has one for the G6.
If you couldn't tell if your engine had one or not, I'd suggest you find a mechanic to install it.

 

[Weller]

i never really looked that hard you think car sales men would no about what they sell morons

True, but you know when a salesman is lying to you, don't you? Because his lips are moving.

 

[Weller]

RSM racing offers a supercharger kit for 3.5's...cant find anything on 3.9 yet..

Opps, my bad, you're right, it's only for the 3.5. I'm not sure why it wouldn't work on the 3.9. Aren't they the same block with a longer stroke?
It's still more work than just slapping a blower on. You'll need new heads, injectors, and I'm sure a few other things, if you want to take full advantage of the supercharger.

 

[Weller]

The 3900 (LZ9) is a different block from the 3500 (LX9) in the G6. It shares parts with the 3500 (LZ4, LZE) in the Monte Carlo and Impala. The LZ4, LZE and LZ9 are completely new 60 degree v6's with VVT.

The 3500 (LX9) in the G6 V6 and GT is based off of the old 3400 in the Grand Am / 3100 in the Malibu. These engines do not have VVT.

So the RSM supercharger for the 3500 (LX9) will not work on the 3900 (LZ9) or the 3500 (LZ4 or LZE).

Thanks, I guess I misunderstood what I was reading. It said the 3.9's bore remains at 99 mm but stroke is increased to 84 mm. But that's just how they got to 3.9L. It never said it was the same block. I'm retarded.