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Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

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Old Yesterday, 05:33 PM   #1
jaboyd
Scooby Specialist
 
Member#: 247304
Join Date: May 2010
Chapter/Region: South East
Location: Knoxville, TN
Vehicle:
2011 STI
WR Blue

Default Headers on a stock EJ motor - benefit?

My question is: on a stock motor/turbo (2011 STI) running a stage II pro tune, EBCS, DW65 pump, stock air box, Q300 catless TBE, will a header add much power? Car currently tuned: 322whp, 372 wtq (Dyno Dynamics) on pump 93, 20.5 psi, but looking for faster spooling, more mid range and bottom end torque on a street only car. Don't necessarily need more hp and tuned for torque and would really prefer NOT having to replace up pipe.

Which brand and style header is best for mid-range torque and better spooling? Planning on EL type but open to suggestions.

Anyone tried the new Killer B 4-1, w/2 bolt mounting?
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Old Yesterday, 05:49 PM   #2
Subie Nic
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Member#: 408745
Join Date: Dec 2014
Chapter/Region: Tri-State
Location: Upstate New York
Vehicle:
2005 STi
Black & Blue

Default

With a tune you could expect a small increase in overall power at stage 2. Biggest difference is going to be throttle smoothness and improved torque in the 3-5k power band. If you're focused on low rpm torque, you won't notice much improvement from UEL to EL. header. IMO an UEL header would be better for low end spooling and power.
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Old Yesterday, 08:05 PM   #3
point78
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Member#: 344329
Join Date: Jan 2013
Location: Summit County
Vehicle:
2008 Wrx, 6mt

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Quote:
Originally Posted by jaboyd View Post
Anyone tried the new Killer B 4-1, w/2 bolt mounting?
I have one, I already had a GS up pipe, so I went 2bolt.

love the header...
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