Hi,

how long needs the cat to be with a usdm header and a jdm cat back?
I know the the pipe sizes are different, I only need to know about the cat lengths

thanks

 

Ok, other question. Is the jdm b pipe longer than the usdm and if yes, how much ?

 

The cat needs to be approximately 13" long.

 

Is it also correct that the b-pipes are the same? The reason the jdm cat is shorted is because the jdm header is longer, compared to the us.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by exies &raquo;</TD></TR><TR><TD CLASS="quote">Is it also correct that the b-pipes are the same? The reason the jdm cat is shorted is because the jdm header is longer, compared to the us.</TD></TR></TABLE>

No. There is a slight difference in the length of the JDM and USDM exhaust manifolds, but the main difference is in the length of the exhaust B-pipes. The JDM cat is shorter primarily because the JDM B-pipe is longer.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Padawan &raquo;</TD></TR><TR><TD CLASS="quote"> The JDM cat is shorter primarily because the JDM B-pipe is longer. </TD></TR></TABLE>


or should that be, the b-pipe is slightly longer because the cat is shorter

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tartje &raquo;</TD></TR><TR><TD CLASS="quote">or should that be, the b-pipe is slightly longer because the cat is shorter </TD></TR></TABLE>

Good point. I should have phrased that differently.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Padawan &raquo;</TD></TR><TR><TD CLASS="quote">Good point. I should have phrased that differently. </TD></TR></TABLE>


you're good dude

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Padawan &raquo;</TD></TR><TR><TD CLASS="quote">

No. There is a slight difference in the length of the JDM and USDM exhaust manifolds, but the main difference is in the length of the exhaust B-pipes. The JDM cat is shorter primarily because the JDM B-pipe is longer. </TD></TR></TABLE>

I see, so I had it backwards. What is this slight different in the manifolds? An inch or two? Or it doesn't even make a difference because the lengths are so close?

 

Ok so lets sum this up

jdm header + jdm cat back = 12" cat
usdm header + jdm cat back = ~13" cat
usdm header + usdm cat back = 17" cat
jdm header + usdm cat back = ~13" cat ?!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ITR3189 &raquo;</TD></TR><TR><TD CLASS="quote">Ok so lets sum this up

jdm header + jdm cat back = 12" cat
usdm header + jdm cat back = ~13" cat
usdm header + usdm cat back = <FONT COLOR="blue">~17.5"</FONT> cat
jdm header + usdm cat back = <FONT COLOR="blue">~16.5"</FONT> cat</TD></TR></TABLE>

Fixed for you.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by exies &raquo;</TD></TR><TR><TD CLASS="quote">What is this slight different in the manifolds? An inch or two? Or it doesn't even make a difference because the lengths are so close?</TD></TR></TABLE>

It's around 3/4", which really doesn't make a difference because of the flexibility in the exhaust hangers.

 

goood info