Ported D25 with pictures and chart!

jacky599r · 01-30-2013, 05:40 AM

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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FuJi K · 01-30-2013, 10:28 AM

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.

jacky599r · 01-30-2013, 10:30 AM

Implications? Remedy?

FuJi K · 01-30-2013, 12:04 PM

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.

jacky599r · 01-30-2013, 12:33 PM

sure, any other thoughts? i am going twinscroll though

FuJi K · 01-30-2013, 03:00 PM

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.

jacky599r · 01-31-2013, 05:31 AM

i am looking at running the OEM stock twin scroll headers. Hand porting is alright?

FuJi K · 01-31-2013, 08:55 AM

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.

01-30-2013, 05:40 AM	#1
jacky599r Scooby Specialist Member#: 137631 Join Date: Jan 2007 Location: Singapore Vehicle: 2006 WRX Red	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! * Registered users of the site do not see these ads.

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01-30-2013, 10:28 AM	#2
FuJi K Scooby Guru Member#: 3687 Join Date: Jan 2001 Chapter/Region: MWSOC Location: St. Paul, MN Vehicle: MY99 GF4 JDM 6spd NF Performance	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.

01-30-2013, 10:30 AM	#3
jacky599r Scooby Specialist Member#: 137631 Join Date: Jan 2007 Location: Singapore Vehicle: 2006 WRX Red	Implications? Remedy?

01-30-2013, 12:04 PM	#4
FuJi K Scooby Guru Member#: 3687 Join Date: Jan 2001 Chapter/Region: MWSOC Location: St. Paul, MN Vehicle: MY99 GF4 JDM 6spd NF Performance	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.

01-30-2013, 12:33 PM	#5
jacky599r Scooby Specialist Member#: 137631 Join Date: Jan 2007 Location: Singapore Vehicle: 2006 WRX Red	sure, any other thoughts? i am going twinscroll though

01-30-2013, 03:00 PM	#6
FuJi K Scooby Guru Member#: 3687 Join Date: Jan 2001 Chapter/Region: MWSOC Location: St. Paul, MN Vehicle: MY99 GF4 JDM 6spd NF Performance	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.

01-31-2013, 05:31 AM	#7
jacky599r Scooby Specialist Member#: 137631 Join Date: Jan 2007 Location: Singapore Vehicle: 2006 WRX Red	i am looking at running the OEM stock twin scroll headers. Hand porting is alright?

01-31-2013, 08:55 AM	#8
FuJi K Scooby Guru Member#: 3687 Join Date: Jan 2001 Chapter/Region: MWSOC Location: St. Paul, MN Vehicle: MY99 GF4 JDM 6spd NF Performance	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.