rhys.l
26-03-2012, 10:00 PM
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 :wave:
B PIPES
Length (flange to flange):
JDM ~195cm, AUDM ~183cm
http://i85.photobucket.com/albums/k53/rocky_mtn50/bpipes1.jpg
(AUDM top, JDM bottom)
Inlet (ID):
JDM 50mm, AUDM 44mm
http://i85.photobucket.com/albums/k53/rocky_mtn50/bpipes_inlets.jpg
(JDM left, AUDM right)
http://i85.photobucket.com/albums/k53/rocky_mtn50/bpipes_outlets.jpg
(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
http://i85.photobucket.com/albums/k53/rocky_mtn50/cats1.jpg
(AUDM top, JDM bottom)
Inlet (ID, effective diameter not diameter at flange or donut gasket):
JDM ~61mm, AUDM ~47mm
http://i85.photobucket.com/albums/k53/rocky_mtn50/cats_inlets.jpg
(JDM left, AUDM right)
Outlet (ID)
JDM 50mm, AUDM 46mm
http://i85.photobucket.com/albums/k53/rocky_mtn50/cats_outlets.jpg
(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
http://i85.photobucket.com/albums/k53/rocky_mtn50/bpipes_withcats.jpg
(JDM top, AUDM bottom)
HEADERS - EK9, JDM ITR (98 spec), AUDM ITR
AUDM ITR next to JDM ITR headers:
http://i85.photobucket.com/albums/k53/rocky_mtn50/jdmheadercomparison.jpg
(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
http://i85.photobucket.com/albums/k53/rocky_mtn50/headers.jpg
(JDM EK9 left, AUDM right)
http://i85.photobucket.com/albums/k53/rocky_mtn50/jdminlet.jpg
(JDM ITR)
Outlet (ID):
JDM ITR 4-1 55mm, JDM EK9 55mm, AUDM 40mm
http://i85.photobucket.com/albums/k53/rocky_mtn50/headers_outlets.jpg
(AUDM left, JDM EK9 right)
http://i85.photobucket.com/albums/k53/rocky_mtn50/jdmheaderoutlet.jpg
(AUDM left, JDM ITR right)
Primaries (OD):
JDM ITR 136mm, AUDM 110mm
http://i85.photobucket.com/albums/k53/rocky_mtn50/primaries.jpg
(AUDM left, JDM ITR right)
Summary: AUDM DC2R header is shorter, and has a significantly smaller outlet and primaries.
B PIPES
Length (flange to flange):
JDM ~195cm, AUDM ~183cm
http://i85.photobucket.com/albums/k53/rocky_mtn50/bpipes1.jpg
(AUDM top, JDM bottom)
Inlet (ID):
JDM 50mm, AUDM 44mm
http://i85.photobucket.com/albums/k53/rocky_mtn50/bpipes_inlets.jpg
(JDM left, AUDM right)
http://i85.photobucket.com/albums/k53/rocky_mtn50/bpipes_outlets.jpg
(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
http://i85.photobucket.com/albums/k53/rocky_mtn50/cats1.jpg
(AUDM top, JDM bottom)
Inlet (ID, effective diameter not diameter at flange or donut gasket):
JDM ~61mm, AUDM ~47mm
http://i85.photobucket.com/albums/k53/rocky_mtn50/cats_inlets.jpg
(JDM left, AUDM right)
Outlet (ID)
JDM 50mm, AUDM 46mm
http://i85.photobucket.com/albums/k53/rocky_mtn50/cats_outlets.jpg
(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
http://i85.photobucket.com/albums/k53/rocky_mtn50/bpipes_withcats.jpg
(JDM top, AUDM bottom)
HEADERS - EK9, JDM ITR (98 spec), AUDM ITR
AUDM ITR next to JDM ITR headers:
http://i85.photobucket.com/albums/k53/rocky_mtn50/jdmheadercomparison.jpg
(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
http://i85.photobucket.com/albums/k53/rocky_mtn50/headers.jpg
(JDM EK9 left, AUDM right)
http://i85.photobucket.com/albums/k53/rocky_mtn50/jdminlet.jpg
(JDM ITR)
Outlet (ID):
JDM ITR 4-1 55mm, JDM EK9 55mm, AUDM 40mm
http://i85.photobucket.com/albums/k53/rocky_mtn50/headers_outlets.jpg
(AUDM left, JDM EK9 right)
http://i85.photobucket.com/albums/k53/rocky_mtn50/jdmheaderoutlet.jpg
(AUDM left, JDM ITR right)
Primaries (OD):
JDM ITR 136mm, AUDM 110mm
http://i85.photobucket.com/albums/k53/rocky_mtn50/primaries.jpg
(AUDM left, JDM ITR right)
Summary: AUDM DC2R header is shorter, and has a significantly smaller outlet and primaries.