Headers - Subaru Enthusiasts Car Club of the Sierras

Jeikun · 2008-03-14, 09:04 PM

A poster from NASIOC posted "As we all know, our 2.5i's come with the dreaded equal length headers" but I haven't really seen any evidence that equal length headers provides "more performance" but generate sound (good or bad, I'm not sure).

Is there any evidence to support this theory that my 2.5i's equal length headers provide more power? (and the follow-up to that is, what would be the benefit to installing unequal length headers)

Sorry, my n00b-ishness with cars is showing again, but this has been bothering me for awhile...
Jake

WRX06TR · 2008-03-14, 09:42 PM

Headers will make minimal difference on the 2.5i. They makes some difference on the turbocharged cars, somewhere around 10hp and 20lb/ft torque (on turbo cars). The biggest difference is sound (all models) and powerband (turbo). Also, there isn't much out for the 08, I have been looking for my g/f she has an 08, but most companies are concerned with the new WRX and STi vs the new 2.5i.

BTW, this is very useful...

http://forums.nasioc.com/forums/showthread.php?t=533787

Jeikun · 2008-03-14, 09:47 PM

Yeah, I checked that out. I guess I missed the headers when I skimmed over it.

MPREZIV · 2008-03-15, 05:51 PM

I can account for headers on the older 2.5's helping to free up a bit of torque, and kinda "move" your usable torque curve down in the rpm range a bit. I couldn't say what's on the market for the newer cars tho, 'cause I ain't lookin'!

wrxkidid · 2008-03-16, 10:03 AM

Quote:

Originally Posted by WRX06TR

Headers will make minimal difference on the 2.5i. They makes some difference on the turbocharged cars, somewhere around 10hp and 20lb/ft torque (on turbo cars). The biggest difference is sound (all models) and powerband (turbo). Also, there isn't much out for the 08, I have been looking for my g/f she has an 08, but most companies are concerned with the new WRX and STi vs the new 2.5i.

BTW, this is very useful...

http://forums.nasioc.com/forums/showthread.php?t=533787

Nick your just on the ball. Slamming down all this tech talk in both new threds? Go study or something

2008-03-14, 09:04 PM	#1
Jeikun EJ22 Real Name: Jake Niedle Join Date: Mar 2008 Location: Damonte Ranch Posts: 427 Car: 2006 WRX Limited Class: little to none	Headers A poster from NASIOC posted "As we all know, our 2.5i's come with the dreaded equal length headers" but I haven't really seen any evidence that equal length headers provides "more performance" but generate sound (good or bad, I'm not sure). Is there any evidence to support this theory that my 2.5i's equal length headers provide more power? (and the follow-up to that is, what would be the benefit to installing unequal length headers) Sorry, my n00b-ishness with cars is showing again, but this has been bothering me for awhile... Jake

2008-03-15, 05:51 PM	#4
MPREZIV Token Real Name: Le Stig Afrique? Join Date: Jun 2005 Location: sitting next to a big yellow box Posts: 3,589 Car: 2001 Impreza 2.5 RS Class: 05 TDSP No, I won't work on your car. F your car*	I can account for headers on the older 2.5's helping to free up a bit of torque, and kinda "move" your usable torque curve down in the rpm range a bit. I couldn't say what's on the market for the newer cars tho, 'cause I ain't lookin'! __________________ "...these condoms have a topical anesthetic to reduce sensitivity, so you can last longer. What a paradox. You can't feel a thing, but you can f*ck for HOURS..."

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2008-03-14, 09:42 PM	#2
WRX06TR EJ251 Real Name: Nick P Join Date: Dec 2006 Location: Reno Posts: 881 Car: 2005 STi Class: MadtyteTunerBro! Back to the studio!	Headers will make minimal difference on the 2.5i. They makes some difference on the turbocharged cars, somewhere around 10hp and 20lb/ft torque (on turbo cars). The biggest difference is sound (all models) and powerband (turbo). Also, there isn't much out for the 08, I have been looking for my g/f she has an 08, but most companies are concerned with the new WRX and STi vs the new 2.5i. BTW, this is very useful... http://forums.nasioc.com/forums/showthread.php?t=533787

2008-03-14, 09:47 PM	#3
Jeikun EJ22 Real Name: Jake Niedle Join Date: Mar 2008 Location: Damonte Ranch Posts: 427 Car: 2006 WRX Limited Class: little to none	Yeah, I checked that out. I guess I missed the headers when I skimmed over it.