Nope That is why they fart through the intake when the butterfly is slammed shut! All the excess boost comes back, out the intake.
Afhoofhooofoooohhhhhhhsihhh

 

I knew that...... but give the guy a break....only 16 posts here on FTE....he's still learning! And he's in a great place to learn!

battlebuggy, go up to the top of the 6.0 forum and get into those "READ FIRST" posts! They will keep you going for DAYS!

 

No one was right..... loose nuts on engine side of cat!!! Actually they were the WRONG nuts.....prob from the headgasket repair a year ago......but I can't prove that.....but it wasn't the first time I found shoddy work from that repair. Many body bolts missing/loose from lifting the cab..... they yanked the plastic push screws from the rubber air dam under the grill.....Don't think I'll be using THAT dealer again.

 

I think I have been having this same problem, at times I hear a noise that sounds like a siren when i decelerate...is that about the same thing??

 

Not what I heard.... mine was really a SCREECHING noise.....like a metal to metal scraping sound. But hey, it COULD be a beginning of what I had... easy enough to check...crawl under and try to wiggle the CAT pipe BEFORE it goes into the cat. Oh...be dang sure the pipe is COLD!

 

**cough** **cough** there isnt a butterfly on 6.0L's either...

(not counting the egr throttle on EARLY '03's)

hehehehehehehe just givin' ya a hard time!!!!