Is that normal for PSE? I asked the dealer and they said is completely normal.

 

Left side of what is dirtier? If you drive on the right side of the road, the opposing traffic will toss debris such that the left side of your lane is likely to be dirtier than the right side of the lane (on a 2 land road), so the left side wheels will pick up more dirt and throw it. Or is it just soot on the exhaust tip?

 

My left side is also dirtier than the right with PSE.

 

For some reason, the left exhaust seems to be dirtier on many cars.
That however has absolutely nothing to do with PSE .

 

Assuming the exhaust from the left and right cylinder banks are totally separate, either exhaust tip should look the same. If not, the imbalance may be due to some cylinder running richer, or leaking.