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I cannot say for sure, but if there is any, it's pretty small...



... and another:

 

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easy way to know is there is a pinion offset, see if there are 2 different part numbers for the rear axles if the meatball is offset to one side or the other the axles would have to be different lengths and there would have to be a dedicated left and right side and 2 different part numbers.

They are 2 different par numbers.

each axle has a compressed length of
Left Side - 31.46"
Right side - 34.25"

which is a difference of 2.79"

Now if you measure from the side of the differential where the axle inserts to the center line of the yoke and you do this on both sides and get the difference between them and then subtract that difference from the difference above you get the pinion offset amount.

I found a good image of the diff and using this we can approximate the offset amount.

Water Automotive tire Gas Auto part Automotive wheel system



The red vertical line is the pinion center line of the diff. The green vertical line is the center line of the main housing. The green horizontal line shows the distance across the housing and is a total of 54 pixels across.

from the pinion center line to the passenger side (left on the image) to the axle interface is 26 pixels and to the drivers side (right image) is 64 pixels. The difference between passenger side pinion to axle and housing center line and passenger side housing is 3 pixels.

so now move over to the drivers side and from the housing center line to the housing side then add 3 pixels. 27 + 3 = 30. and from that mark to the axle interface is 30 pixels.

so now we know that the axle length difference of 2.79" is equal to 30 pixels. lets get how much each pixel is worth. 2.79 / 30 = 0.093"
in dark green is the housing housing center line to pinion center line difference which is 4px.
4 * 0.093 = 0.372

0.375 = 3/8ths of an inch

This is a guesstimate without getting under the car to measure the housing side to pinion center line for each side of the differential. Taking those numbers and getting the difference between them and subtracting that difference from the difference in the lengths of the axles would get you an approximate offset amount. The offset should be to the passenger side of the car.

Be interesting to know if the guesstimate of 3/8" is correct or not.
 
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I took the image @TomatoSoup posted and corrected the tilt and corrected the lens distortion from the camera. Drew some marker lines to know the lens correction was really close to correct and drew a center line down the car you can then see the driveshaft offset to the passenger side of the car.

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Here is a more corrected image fixing the perspective angles. I used the wheel base and the track width to align the tires to those points.

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You can still see there is an offset
 
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Oh you are right!!! had the angle slightly off.

This should be better

Automotive lighting Automotive tire Motor vehicle Rim Toy


I know it's not perfect... but it does shot it to be off slightly to the passenger side of the car.

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green line is center driveshaft and red line is center vehicle
 

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Using the 2 images above we know the track width of the solstice is 60.7" for the front. the line that represents the front track width is 417 pixels long.

60.7 / 417 = 0.145

the red line and the green line in the second image is 3 pixels apart.

0.145 * 3 = 0.435
0.375 = 3/8"

pinion offset being in the area of 3/8" should be pretty close. I have used 2 different images and they both land +- 1/16th of 3/8"

pretty cool that images can be used to get a rough idea of a measurement.
 

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Be interesting to know if the guesstimate of 3/8" is correct or not.
It's not.

Driver side seal face to pinon centerline is 139mm, passenger is 69mm. The difference between these two is 70mm or 2.756 inches. A number close to but not quite equal to the 2.79 difference in half shaft length, the remaining difference obviously a result of the different length half shafts being at slightly different angles between differential and knuckle.
Automotive tire Automotive lighting Auto part Motor vehicle Cylinder
Camera accessory Camera lens Font Cylinder Cameras & optics


A much better way of checking that the pinion is centered that allows us to ignore the advanced 3D half shaft trigonometry and doesn't rely on assuming the ring gear offset is equal to difference in half shaft length is to check pinion location relative to the two mounting bosses, which we (well, I, anyway) know are centered on the car. Doing so show you'd find both are exactly 178mm from pinion center.

So to answer the original question, no, the pinion is not offset in the chassis.
 
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where the pinion gear is in relation to the mounting holes on the differential has zero to do with the pinion being offset in the vehicle. The differential does not have to be bolted in the middle of the car. The differential can and often is offset to the passenger side of the vehicle by < 1"

The difference in angles because of one of the axles being longer is going to make a < 0.01" difference in the length. And using distances that are isolated to the differential only is NOT gong to tell you if the pinion is offset from the center of the vehicle. you need a point of reference on the vehicle to measure from that is a constant like the track width. You can also use the back side of the knuckles so long as the vehicle is sitting level or of the suspension is hanging so long as the suspension hangs the same distance on both sides.
 

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where the pinion gear is in relation to the mounting holes on the differential has zero to do with the pinion being offset in the vehicle. The differential does not have to be bolted in the middle of the car. The differential can and often is offset to the passenger side of the vehicle by < 1"

The difference in angles because of one of the axles being longer is going to make a < 0.01" difference in the length. And using distances that are isolated to the differential only is NOT gong to tell you if the pinion is offset from the center of the vehicle. you need a point of reference on the vehicle to measure from that is a constant like the track width. You can also use the back side of the knuckles so long as the vehicle is sitting level or of the suspension is hanging so long as the suspension hangs the same distance on both sides.
... to check pinion location relative to the two mounting bosses, which we (well, I, anyway) know are centered on the car. ...
 
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