Hello,
EG4 Civic with swap engine is B16A2 with port&polish head. I got the uper header. What exhaust will be the best? 2" or 2,5"

 

I would continue 2.5" all the way back from the collector.

 

Ok, but is it maybe too "wide" for stock engine?

 

i'd go with a 2.5"

 

2.5" works fine

 

2.5
/thread

 

You don't want to bottleneck your exhaust.

 

2.5" ftw.

 

2 BlueIntegraBoy: What that means?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Oggy_EG4 &raquo;</TD></TR><TR><TD CLASS="quote">2 BlueIntegraBoy: What that means?</TD></TR></TABLE>

I can answer this for you...If your header is the 98+ JDM ITR header the collector is 2.5" so if you get a 2" exhaust you will get a bottle neck effect (like an old fashioned coke bottle)

 

2.5

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Agent_EM1 &raquo;</TD></TR><TR><TD CLASS="quote">2.5 </TD></TR></TABLE>

X2 it would not be right to put a smaller exhaust then the size of the header collecter which is 2.5 inches on an ITR header

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16b-EJ8 &raquo;</TD></TR><TR><TD CLASS="quote">

I can answer this for you...If your header is the 98+ JDM ITR header the collector is 2.5" so if you get a 2" exhaust you will get a bottle neck effect (like an old fashioned coke bottle)</TD></TR></TABLE>

Correct.

Here's my 2 minute drawing...

 

Tnx all!!
Then 2.5 it goes

 

for 2.5

 

2.5" FTW

 

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

this is good info for nOOb's !

 

Stock B16
+JDM ITR exhaust header
+Fujitsubo LegalisR 2.5"
=Buhahahaha
before 161 HP
Now 151 HP
Where is the catch?

 

everything really the same? same dyno?

 

Same dyno
Temperature was 10 degrease higher. I don't believe that causes the runaway of horses

 

you cant compare numbers from different days with different weather conditions even if it's on the same dyno

 

OK, but in the driving I feel the lack of power. 10 HP is too much to lose including the different wheather conditions.