Bone stock 04 except 4in mbrp straight pipe. 55k miles. In the last 2000 miles the truck has had new egr valve, egr cooler, oil cooler, and head gasket. Last thursday it was in for an oil leak which was just a turbo boot that had a crack in it they said. I told them it was smoking a little when i cold started it. They replaced the egr valve again and tested out all the injectors and all was good. Now the truck is smoking alot more on cold starts, and half the time when i plug it it. Starts right up and idles fine and has power just smoke for about 5min once high idle kicks in, then for about 1/2 mile down the road until it comes up to temp. Every now and then ill get a poof while accelerating from a light, i will also here a weird "woosh" sound when it does. I crawled under the truck to check all the exhaust clamps after i drove it a bit with the new exhaust and one was a little loose and had really black oil coming from it.