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as long as the exhaust exits the vehicle behind the cab I dont see a problem. . .but then again we are talking about the Communist republik of Kali4nia
Stacks are legal. No one is gonna bug you about it unless your being stupid. So if your not stupid about it your ok. If you live in the bay area and need the best place to go let me know.
A semi has stacks, so why would they be not legal on a truck?
Only because certain trucks fall into certain classes is where they approve/deny things that one can have that a lower class can or can not have... kinda like how a Semi can be louder then a passenger vehicle... and so on..