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Those are clean air pipes-part of the emissions package for the truck. The idea was to let clean air into the exhaust to promote complete combustion of any remaining unburnt gas exiting the exhaust. Some used a belt driven air pump off the crankshaft, others used a different pulse driven device to let air into the pipes. If you live in a state without annual inspections, you could do away with the whole system if it isn't working anymore-just cut off the pipes and crimp them tightly closed. I had a shop torch mine off and weld them shut for a neater appearance. But if you have those inspections, the missing emission control devices may not let you pass.
The only component that must stay in place to pass federal emissions is the catalytic convertor. If you are not concerned with emissions then a straight pipe will be fine. There will not be any adverse performance problems with a straight pipe. Please rate my help this helps me out , Thankyou RJ
take the inter cooler pipe of turbo and try to move the fan or bolt inside the turbo, if you can then theres a problem with the bearing probably oil starvation parts of the fan will have been sucked through the engine so this could cause the smoke problem if the plastic is stuck in the exhaust valve check all oil lines and air lines, try getting some one to hold rag over exhaust pipe and look in engine bay if you can see smoke/exhaust gases coming from turbo unit then theres a leak somewhere,
its a complicated problem and without being there i cant really help anymore than that, sorry jezza