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Old 01-30-2013, 05:40 AM   #1
jacky599r
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Member#: 137631
Join Date: Jan 2007
Vehicle:
2006 WRX
Red

Default Ported D25 with pictures and chart!

Yo guys,

Since I am rebuilding my engine, i took the leap of faith and sent my heads for some head work. Attached are some pictures and charts for your reference. I would be glad to see some comments about it! Good day!







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Old 01-30-2013, 10:28 AM   #2
FuJi K
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Chapter/Region: MWSOC
Location: St. Paul, MN
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MY99 GF4 JDM 6spd
NF Performance

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I always see the dog leg outlet ported oval towards the straight port; egg shaped. If holes on your header flanges are same size as stock outlets, there will be a step.
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Old 01-30-2013, 10:30 AM   #3
jacky599r
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Implications? Remedy?
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Old 01-30-2013, 12:04 PM   #4
FuJi K
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Have the port on the header flange opened up. Use the OEM ex-manifold gasket to as reference to how far to open up the flange.
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Old 01-30-2013, 12:33 PM   #5
jacky599r
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sure, any other thoughts? i am going twinscroll though
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Old 01-30-2013, 03:00 PM   #6
FuJi K
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Location: St. Paul, MN
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MY99 GF4 JDM 6spd
NF Performance

Default

Twinscroll or not, it's a step. What headers are you planning to run? Have you compared it with the gasket?

Welding is usually what is needed to fix over enlarged outlets and then blended back with the runner. The red outline is the OEM gasket.

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Old 01-31-2013, 05:31 AM   #7
jacky599r
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i am looking at running the OEM stock twin scroll headers. Hand porting is alright?
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Old 01-31-2013, 08:55 AM   #8
FuJi K
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Chapter/Region: MWSOC
Location: St. Paul, MN
Vehicle:
MY99 GF4 JDM 6spd
NF Performance

Default

Hand porting is fine. Use the gasket first to see how much you have to go over. The factory exhaust header isn't really thick so you don't want to get into that or into the welds.
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