Ok, I know the fronts on the Sedan Sport is bigger than the non sport trim. What I don't know is if the rear rotors are bigger as well? Or are the rears on the sport the same size as other trims?

 

It's larger.

Journey:
F: 12.6 x 1.102
R: 12.13 x 0.630

(w/) Sport:
F: 12.99 x 1.26
R: 12.99 x 0.63

 

Pads are the same however.

 

Are they calipers the same? I keep seeing non-sport sedans with two-piston calipers where are my sedan with sport pacakge only has single piston calipers.

 

Not sure with the rears, but the front calipers are definitely different. Journey has two-pistons, smaller caliper overall, while the Sport has a larger one-piston caliper design.

Here's an interesting trivia. All else being equal, a 1-piston sliding caliper has the same effect as having a 2-piston fixed caliper design.

 

**pads are not the same the g35S uses different front pads, mayb the rear mayb the same but definitly not the front already made that mistake!