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stock downpipe expansion?

681 views 2 replies 3 participants last post by  GregsSD 
#1 ·
MY truck my sig. on the stock downpipe under the truck theres about a foot of it thats an inch bigger the the rest like an expansion chamber or something, its all heat wrapped, so i cant tell, anyone know???:dunno:
 
#2 ·
My 03 had I believe it was called a resignator in the downpipe. It helps take out some of the drone and whistle the 03 turbo creates. I know when I removed my exhaust and put on aftermarket the whistle was crazy loud but you will get use to it.
 
#3 ·
That's correct. All it is for is to cut down on some of the whistle that the 03 turbos make.
 
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