I've always been curious on the exact differences between the jdm and audm dc2 type r exhausts. I.e., exactly how badly we got jibbed. Today I had an almost complete set of each, so I took a few measurements whilst they were in bits. Could be useful as a future reference for some, or just for interests sake if you're a nerd like me
B PIPES
Length (flange to flange):
JDM ~195cm, AUDM ~183cm
(AUDM top, JDM bottom)
Inlet (ID):
JDM 50mm, AUDM 44mm
(JDM left, AUDM right)
(AUDM left, JDM right)
Outlet (ID):
JDM 47mm, AUDM 47mm
Pipe (OD):
JDM 180mm, AUDM 180mm
JDM b pipe (98 spec) has 3 resonators, AUDM b pipe has 2 resonators.
Summary: JDM b pipe is longer, has 1 extra resonator (98 spec), and has a larger diameter inlet. Otherwise, same.
CATS
Length (flange to flange):
JDM 304mm (12"), AUDM 447.5mm
(AUDM top, JDM bottom)
Inlet (ID, effective diameter not diameter at flange or donut gasket):
JDM ~61mm, AUDM ~47mm
(JDM left, AUDM right)
Outlet (ID)
JDM 50mm, AUDM 46mm
(AUDM left, JDM right)
JDM cat transmits more light when looked through. This could be because it is higher flow or just because it is shorter
Summary: JDM cat is shorter, has a larger diameter inlet
and outlet
B PIPE AND CAT
AUDM system is slightly longer
(JDM top, AUDM bottom)
HEADERS - EK9, JDM ITR (98 spec), AUDM ITR
AUDM ITR next to JDM ITR headers:
(AUDM left, JDM right)
Horizontal length from flange to flange:
JDM ITR 463mm (EK9 same), AUDM 433mm
Inlets (ID):
JDM ITR 4-1 47 x 35, JDM EK9 46 x 33.5mm, AUDM 48 x 34mm
(JDM EK9 left, AUDM right)
(JDM ITR)
Outlet (ID):
JDM ITR 4-1 55mm, JDM EK9 55mm, AUDM 40mm
(AUDM left, JDM EK9 right)
(AUDM left, JDM ITR right)
Primaries (OD):
JDM ITR 136mm, AUDM 110mm
(AUDM left, JDM ITR right)
Summary: AUDM DC2R header is shorter, and has a significantly smaller outlet and primaries.
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