I just figured out that the dynomax intermediate pipe is 2.5", compared to the 2.75 OE imtermediate pipe on the N10 factory setup??

why would dynomax go smaller that OE? doesn't make sense????

thx
Larry

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89 Formula
96 Impala SS

 

ask them for a stock replacement system. tell them what you have. Someone just said they got a 2.75" system from them unless he can't measure and it was really 2.5". As for their catbacks, the 2.5" is the only system they offer. They still have all the pieces to put together their old 3" catback system if you get all the part numbers together. I have the numbers for the 3" pipe in my sig.

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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

 

my car is the same as yours, 89 WS6, except you have headers. My N10 dual cats are staying stock with OE manifolds. So I need the intermediate pipe that connects to the stock cats.

Is that what you have?
I definately want a quiet 3" cat back, and I though the dynomax was the ticket.... well until I found out it's 2.5" and stock was larger.

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89 Formula
96 Impala SS