2.5" downpipe.  This is a factory downpipe for some Turbo/Dodge cars, but not all. 
 
This is a factory replacement downpipe for:
 
1989 Daytona Shelby with 2.2L Turbo II engine
1989 Lebaron GTS with 2.2L Turbo II engine
1989 Lancer Shelby with 2.2 Turbo II engine
1989-1991 Daytona Shelby with 2.5 Turbo I engine
1992 Daytona Iroc Shelby with 2.5 Turbo I engine
1991-92 Spirit R/T - 2.2L turbo III
1992-93 Daytona Iroc R/T - 2.2L turbo III
 
If you have (for example) a 1988 or older 2.2 Turbo/Dodge car and you want to run a larger o2 housing on your turbocharger you will need to upgrade the size of your downpipe - to the downpipe listed here.
 
Note that in order to run this downpipe you MUST also have the larger 2.5" o2 housing.  (you can find that in our Turbo section).
 
Note that this pipe has been cleaned, blasted, and ceramic coated high temp black.  We also carry these large 2.5" downpipes without a coating.  These are OE factory original downpipes, not some home made pipe.
 
Also note these are a FULL 2.5" ID *****mandrel bent*****.  (not kink bent like some other vendors).  
 
We also carry 3" downpipes as well, but those will give you absolutely ZERO horsepower increase until/unless you are well north of 400hp.    You can go deep into the 11 seconds in the 1/4 mile with a 2.5" downpipe.