Straight Pipes

Yes, after they spin around the compressor wheel, it exits thru the s-pipe or downpipe as some call it.

Here is a basic video of how it works. The exhaust is explained at about 1:00 into it.

[ame]http://www.youtube.com/watch?v=vGhlgphrBxA&feature=youtube_gdata_player[/ame]

 

Yes, and you also now understand why they cause so much damage when they finally do go out.

 

I have a 5 min timer programmed on my truck

 

I wait tell EGT's are below 300 degrees.
Usually by the time I get parked a update the log its cool enough to shut down.

 

120k rpm is pushing it for a cast compressor wheel. Some people are a bit dramatic when it comes to turbo cool down. The bearings don't completely dry out the second you shut the truck down. Letting it idle for 10 min like some do is overkill. A timer is one thing but stairing at the window waiting on a certain temp is a bit much. I've destroyed several turbos and none were due to shutting down hot. 3 were broken shafts (junk stock Cat 6NZ turbos) and 2 were due to an exhaust gasket sleeve.

 

My general rule of thumb on turbo cool down in the spring, hot summer days, and fall is to let the truck slow idle with the engine fan on while I'm parked at the fuel island. Punch the info in the pump to start it, raise the hood, get the fuel going in the tanks then walk around to shut the truck off. That's about 4 or 5 minutes before I shut it off. Check everything in the engine well, belts, hoses, clamps, grab steering shaft and twist checking for losseness or play - finish up topping the tanks - by then the oil is drained down completely and ready to check. In the winter time when temps are really cool slowly exiting the interstate and rolling to the fuel island from there is sufficient cool down imo so I don't leave it running as long then. It just depends on how hard you've been working the truck and the idea is to get the temps down to normal idle temps before shutting it off for the turbo bearing to be sufficiently cooled down preventing premature failure... Common sense approach...