anyone know what size is the dual cat intermediate pipe, from the factory?

thx

 

max stock f-body pipe is 2.75" unless you have a SLP special model.

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-Tas
'89 Formula WS-6

305, TBI, 700R4, P.A.W. 14x3 open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips, Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248)
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options

 

Mine is 3" then it crimped down to 2.5" for the muffler.

 

I just measured my OE N10 intermediate pipe. It is indeed 2.75" and where it bends over the axle it is 2-5/8".

so a dynomax 2.5" dual cat back is stupid. although I wanted something quiet, I might have to go SLP, or put together a 3" dynomax like Taz says is available.

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89 Formula
96 Impala SS