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06-07 LBZ Performance Discussion of Chevy and GMC Trucks with LBZ Duramax Turbo Diesel Engines Related To Performance And Longevity

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  #11  
Old 10-29-2009, 06:55 PM
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now i have 4in straight pipe right now. can i only go from 4" to a 5" aussie or can i get 6" tips with 4" pipes?
 
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  #12  
Old 10-29-2009, 11:19 PM
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I think you can add reduces onto the bottom of the stacks to make it work. I know that the bigger grand rock stacks go down to 5" but like I said a reducer should work, but don't quote me on that
 
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  #13  
Old 11-01-2009, 09:56 AM
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Originally Posted by stkdram55
the biggest thing you would have to worry about with rain is if it did rain enough in theory it could get all the way up to the turbo and hydro lock the engine...but were talkin and ungodly amount of rain...the biggest thing that will happen is the flex pipe will start to rust out after a few years of rain getting down in there...like mine

If it rained enough to fill your exhaust system back to the turbo, I think the truck would be under water and the least of your worries
 
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  #14  
Old 11-02-2009, 10:08 PM
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would a 6" stack have a different sound coming from 4" downpipe rather than a 5" stack?
 
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  #15  
Old 11-02-2009, 10:18 PM
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buddy of mine found 8'' turns outs and the actual hole that u see is like 11 and 3/4 and the reduced to 4'' but they were very very pricey.. took a BIG bill to get them..
one with 3 0's
 
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  #16  
Old 11-03-2009, 10:29 AM
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Originally Posted by dieseldocter16
I had straight cuts on mine w/ rain caps and after bout 3 months the dinging of the caps started drivin me nuts. So now i'm runnin mitres and it's rained all week and so far i've havent had a problem.
You have way more tolerance than I do. I had a rain cap on my straight cut for about a week. Now it's sitting on a shelf. Sumbitch, those things are annoying! Now if its raing hard, I go out and put a lid from a can of Gator-aid mix on it.
 
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  #17  
Old 11-10-2009, 05:24 PM
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drill a small hole in the bottom of ur 90 so the water has some where to go....mine has been in snow and rain storms without being covered, and its a mittered cut....so no worries.......
 
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  #18  
Old 03-13-2012, 08:42 AM
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i have 7'' aussies and never need to cover them if you are worried about water drill a 1/8th '' hole at the lowest point under thy y pipe
 
Attached Thumbnails Stacks...-image-2-.jpeg   Stacks...-image-1-.jpeg  
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  #19  
Old 03-14-2012, 09:58 AM
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Default my stacks
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  #20  
Old 03-19-2012, 10:23 AM
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+1

drill a small hole at the lowest point. the exhaust will rust faster from the inside out.. otherwise when you start it after a heavy rain it will throw soot filled nasty water 10' up in the air which will rain back down on your truck or whatevers nearby and make it nasty.
 
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