hi again everyone, I am going to buy stainless manifold headers and up pipe but i would like to know whether to keep the unequal length pipes or, go for equal length as i have been told that equal length would be better for performance?

Regards.

 

For unbiased advice I'd PM Harvey on here

Shaun

 

can I ask what power have you got, and what power are you planning?

 

i thinking the same but im more likey to get unequal because i'd like to keep the scooby rumble... still looking around for prices at the moment not sure where to get them from.... i was looking at flat 4 but people have had bad experiences with that website ....

 

check out this link ...i thought the price was good n seems to have everything like 304 stainless steel....etc....
Subaru Impreza Stainless Steel Tubular Manifold Spec2

 

See post 2........... I'd have a word with Harvey.



Shaun

 

i will drop him an email then midlife..... do you have harvey unequal/equal headers ?

 

The answer to that is "no"......I currently run a set of RCMS headers.. so there is no bias

I've been on SN for a good number of years and I'd find it difficult to challenge Harvey's honesty and knowlege.....especially on this particular topic

Shaun

 

thanks for the help, how do i PM Harvey? I have never done it before. Do you have to be a full member?

 

Harvey is a great guy, always willing to help.

His contact details are here...

 

get the unequal lenght one to keep subaru rumble

 

thank you, i have sent him a message

 

get yourself on e-bay there half the price mate!

 

Be a little careful with buying headers. A lot of the designs tend to be aimed at US STIs and they have always had 2.5L engines. As a result, tube diameters tend to be bigger or too big for reasonable spool/lag on our dinky 2.0L engines. Also, a lot of them appear to be cr*p.

IMO: If your power goals are anything under 350BHP, consider ported standard headers. Equal length SS headers will lose the "Scooby rumble" resulting in an apparently quieter car. There are or were plenty of vids on youtube for comparison.

Oh, and if you change the headers for aftermarket, it's recommended to remap.

J.

 

Info on headers from one of the most successful tuners in the country:

AndyForrestPerformance

For turbos of VF34/35, TD05-16g size and above I would recommend decent aftermarket tubular headers.

 

Id be inclined to have a set of Harvey Smiths ported cast OEM manifolds. They wont crack either, something that Andy Forrest is still struggling to achieve with fabricated manifolds, I believe.

 

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I'd have to agree with Simon on this one

Shaun

 

I'd recommend lateral's headers good quality and price

 

I have found a header with larger diameter pipes and ported and polished heads. I will be running a TD05-20G turbo. Any good?

 

As someone said above the unequal length will help retain the scooby rumble, even though from what I understand the equal will give a slighty more BHP.

I'd be more concerned about either getting the headers ceramic coated or bandaged wrapped for heat retention.

 

I have always used the groupe S headers and have had no problems with them and always get good results