Exhaust Header
06-26-2003 | 04:31 AM
#1
Thread Starter
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Joined: Jun 2003
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From: IL
Exhaust Header
I have been looking through this forum the last few days and I have come across some different opinions, I was wondering if a header on a 2000 civic Si would gain that much horsepower or not since it already supposedly had high flow exhaust. If I did get one is it ok for a car that is a daily driver.
P.S. what is better 4 into 1 or 4-2-1
P.S. what is better 4 into 1 or 4-2-1
06-26-2003 | 05:05 AM
#2
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Joined: Jan 2003
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From: Arizona
yes. a 4-1 is good for high range power, its only pratical in racing applications IMO, and 4-2-1 is good for low-mid range which is good for daily driver. i think its low-mid range :dunno: it goes something like that. someone correct me if im wrong
06-26-2003 | 05:30 AM
#3
Still here... sorta...
Joined: Sep 2000
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From: CO
I have owned both the 4-1 and 4-2-1. I prefer the 4-1 on my B-series motor because I feel like I get more power out of it. The clutch/flywheel I have are all I need for my low end and when I'd run my car at the track with the 4-2-1 I had NO top end at all.
4-2-1 is more practical, but you have a B-series so I'd go with the 4-1.
jmo
4-2-1 is more practical, but you have a B-series so I'd go with the 4-1.
jmo
06-27-2003 | 03:55 PM
#5
Still here... sorta...
Joined: Sep 2000
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From: CO
header.. no s.. it's singular. 
A 4-1 means that you have 4 cylinders thus you have 4 exhaust ports on your head. You bolt your header to your head at these 4 ports. That is where the 4 comes from. (not being an ass.. you asked)
The header then bends around and comes to a single collector that meets up with your cat.
The 4-2-1 wraps around and becomes 2 pipes and then 1 at the collector into the cat. Making it 4 pipes to 2 pipes to 1 pipe.
hih
A 4-1 means that you have 4 cylinders thus you have 4 exhaust ports on your head. You bolt your header to your head at these 4 ports. That is where the 4 comes from. (not being an ass.. you asked)
The header then bends around and comes to a single collector that meets up with your cat.
The 4-2-1 wraps around and becomes 2 pipes and then 1 at the collector into the cat. Making it 4 pipes to 2 pipes to 1 pipe.
hih
06-27-2003 | 04:00 PM
#6
Just another import lover
Joined: Jun 2003
Posts: 481
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From: NB, Canada
piping my friend 
This is a 4-1
http://www.doctorimport.com/dc_sport...ader%20Systems
this a 4-2-1
http://www.doctorimport.com/dc_sport...ader%20Systems
notice the piping dude. 4-2-1 means 4 pipes into 2 then running to one
This is a 4-1
http://www.doctorimport.com/dc_sport...ader%20Systems
this a 4-2-1
http://www.doctorimport.com/dc_sport...ader%20Systems
notice the piping dude. 4-2-1 means 4 pipes into 2 then running to one
06-27-2003 | 04:03 PM
#7
Just another import lover
Joined: Jun 2003
Posts: 481
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From: NB, Canada
oh ya thes arn't going to give you all that much more hp homy! it wont effect your daily driving but if you don't have too much done to your engine...ie( turbo) then it wont make that much diff either 
06-27-2003 | 04:09 PM
#9
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Joined: Dec 2002
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From: Alabama
Originally posted by alllooksnnogo
oh ya thes arn't going to give you all that much more hp homy! it wont effect your daily driving but if you don't have too much done to your engine...ie( turbo) then it wont make that much diff either
oh ya thes arn't going to give you all that much more hp homy! it wont effect your daily driving but if you don't have too much done to your engine...ie( turbo) then it wont make that much diff either
sorry about that my bad