Stock turbo/downpipe info needed - Diesel Bombers

1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

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Old 04-18-2017, 10:45 PM
89tractor's Avatar
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Join Date: Apr 2016
Location: California
Posts: 9
Default Stock turbo/downpipe info needed

The kid who I bought my truck off of did a real hokey joke job with the exhaust, stock downpipe to the end of the cab, then a 4 inch adapter to some flexibend tube up to a giant bed stack. Kids these days.. Anyways I am redoing the whole exhaust to 4 inch turbo back, but need a little help. I have a 1989 with a stock turbo, when I look at Downpipes there are different flange options. So which one do I need?
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Old 04-19-2017, 01:41 PM
u2slow's Avatar
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Join Date: Dec 2010
Location: Salt Spring Island
Posts: 537

You want the basic/stock v-band style. Its 2.5" or 3" depending who you talk to. The stock pipe is 3", but its smaller at the v-band coupling.

You can see my 'stock' fabricated flange with a DE 4" kit for the 'stock' turbo here:
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