I see around where that some of you port the OEM Headers.
How can I do this (anyone have fotos)and what are the improvements that I can have whit this mod.
It worth?
And the dark side of this???

Thanks

 

Poo picture i know. The one on the right is ported, the one on the left is not.

Basically take the manifold off and you wiil see soot lines on the headers, that is because the gasket has a bigger bore to the header. All you have to do is grind away the metal to the soot lines, flaring it in as it goes down the pipe.

We used an air powered grinder IIRC, which made it easy, some people use their black and decker or dremel, but that takes longer.

Hope it helps.

No real downside as far as i am concerned, its supposed to give you better spool up, but as i did alot to the car at the same time i could not comment.

 

I see a few slip-ups there

If you do this with a die grinder then wear a mask......

F

 

Steven is that mine or yours??

We were using a die grinder... wtf would you want to wear a mask?

Saftey glasses yes..

Also we used a TCT Cutter... and 80,000rpm and a tct cutter its hard not to slip..

Also get some new gaskets steven..

David

 

i can vouch for the dremel taking along time and also using a few grinding bits aswell mine looked a lot neater than that


kev

 

david its mine, the one you did though, as we did not take any pics of the side i did. probably more slip ups

 

Got ported headers on my MY02 at the same time as up-pipe, so can't definitely say which mod did what, but defo helped with turbo coming in earlier, bigger torque curve, etc. Also seemed to reduce some of the boominess from the exhaust at low revs whilst making it snarl more (in a very nice way) at high revs. To my mind quieter when you're not using it, and more & nicer noise when you are is exactly what you want. I have a noticeably better torque curve than some people with a similar setup but without ported heders, so I suspect they help a fair bit.

Downside? Cost if you pay someone else to do it. Hassle if you don't. That's about it to my mind. Oh and change the gaskets!

 

Flat4... POFF...

Mine are neat, but stevens were done quick.. (his side was neater though..)

Just to add I have broken three fingers on my right hand, severed three tendons.. and as a result it hurts.. When it gets cold... air tools get cold...

David

 

David

Mask? Well when I had the Die Grinder going at 24000rpm with carbide burrs, the air was filled with metallic dust and that can't be good for you! My whole garage was covered with particles of metal, it went everywhere.

I wore goggles as well of course.

You chaps must be made of metal by now from the amount you must have breathed in, perhaps they'll make Terminator 3 with you as extras?

F

 

Lol... this cutter was lethal... look at the vice... it certainly wasnt coming off as dust..

David

 

More like bloody splinters, as i can testify. Having to lie underneath the car putting the bloody things back on, 1000's splinters in hair (what little i have), it bloody hurts.

 

Yes, I had splinters as well and the bits that i've missed when clearing up, have gone nice and rusty all over the place...

F

 

What is the Gaskets???

Thanks

 

Use the old ones! Just make sure you get them the right way round.

F

 

I would like to know if whit this modification we lost the Subaru "sound" (beat of boxer engine).

Thanks

 

Nope you wont lose the boxer sound as this is to do with teh unequal length manifold.

 

How much are a set worth??

David

 

What set David?

F

 

A set of ported headers...

I might be selling mine

 

David - IIRC scoobysport charge £200 to port them for you, which is what you'd be competing with, I guess.

 

Can anyone reccomend which stones to use to carry out this Mod??
Am gonna borrow a high power 'drill' but aint sure which stones to use??
Thanks
Rob

 

dont bother.. they wont touch it...

You want a tct cutter... they are quite pricey though... and you need a die grinder really.. not a drill.

David

 

I used a parallel Tungsten Carbide Burr when I did mine, ripped it out in short order and with a good smooth finish. Available from most tool shops or the likes of RS Components or Farnell. As David says stones will just clog up, a course one can be used for touching up though.

cheers

 

£200

Me thinks mr wallis will be adding another service to his list. Infact, sod it, will have to get my new compressor set up now

 

ok... Anybody want any doing... email me off board...

And Ill beat stevens quote..

David

 

I do, i do .

Tony.

 

50:50 then dave, you do one side i will do the other

 

out of interest, I was going to have the turbo side manifold built up with weld so it could be enlarged to mate with a larger up-pipe.

On this subject, I want to get set up with a die grinder of some sort. I have considered getting a compressor, but need a large one to be worth it. I've also considered an electric one with a flexible shaft drive. Electric is a lot quieter if you do much with it, and you never have to wait for air.

Also combined with the fact I would like a decent impact wrench. I have a 3/8" snap-on one, but seems to be on permanent loan to someone. Was thinking of one of the 1/2" drive cordless ones from sealey, about £240 on offer.

Paul

 

Puff, take your gloves off and get an air one

 

I have hot water.