Why three stacks?

Must be for those new 9 cylinder engines.

 

CARB would care to differ on this lol

 

Much like the owner's brain.

 

Truck is so bad it needs three stacks.

 

All the trucks I've seen with three stacks have been container haulers that run out of the ports in CA. Usually a truck that had stacks behind the doors. You can't enter the ports with a truck older than a certain year without a particulate filter, so a lot of those trucks have an aftermarket stack with a filter behind the sleeper and leave the old stacks on for looks. Its always a weird thing to see.

 

My uncle did this with his truck. Came time for him to replace the mufflers and exhaust on his truck, figured it was stupid money for the mufflers, replumbed his exhaust but couldn't take off the pipes due to holes in his body. So he just kept them on his truck. The back one is functional, the front two are just there.

 

Replacement mufflers are $89 thru Truckpro or Ryder, so that makes it odd he spent more on plumbing a new exhaust??

 

Good call. The one in the picture has a DPF stack (behind the cab) so that could be the reason why.

 

Yeah beat me to it. Looks like he was putting dual stacks on but didn't get it finished for whatever reason

 

Sorry, we have alot of new paccar trucks in our fleet with stacks and they do not have a seperate weed burner exhaust on them. The stacks are fully functional.