These headers any good?
15 August 2011, 03:09 PM
#1
These headers any good?
Hiya
Unfortunately the stainless steel headers on my car are blowing at the flexi joint.
Does anyone know if these are any good to replace?
http://www.ebay.co.uk/itm/Impreza-wr...item415c5d26c2
I do have some standard headers in the shed which apparently have been ported but I'm unsure who did them.
Unfortunately the stainless steel headers on my car are blowing at the flexi joint.
Does anyone know if these are any good to replace?
http://www.ebay.co.uk/itm/Impreza-wr...item415c5d26c2
I do have some standard headers in the shed which apparently have been ported but I'm unsure who did them.
15 August 2011, 03:33 PM
#2
99% of the S/S manifolds on eBay are ****e. In my personal opinion steer well clear, cheap ones will only crack etc.
If you want to stick with S/S then try Lateral. I use their GT-Spec manifold and it's a lovely piece of kit.
Otherwise there is Harvey on here, he does ported standard manifold and up-pipe at a good price. And from what I've read they are very good.
If you want to stick with S/S then try Lateral. I use their GT-Spec manifold and it's a lovely piece of kit.
Otherwise there is Harvey on here, he does ported standard manifold and up-pipe at a good price. And from what I've read they are very good.
15 August 2011, 03:37 PM
#3
99% of the S/S manifolds on eBay are ****e. In my personal opinion steer well clear, cheap ones will only crack etc.
If you want to stick with S/S then try Lateral. I use their GT-Spec manifold and it's a lovely piece of kit.
Otherwise there is Harvey on here, he does ported standard manifold and up-pipe at a good price. And from what I've read they are very good.
If you want to stick with S/S then try Lateral. I use their GT-Spec manifold and it's a lovely piece of kit.
Otherwise there is Harvey on here, he does ported standard manifold and up-pipe at a good price. And from what I've read they are very good.
JohnD
15 August 2011, 07:31 PM
#7
From the photo the headers above look OK with the exception of the uppipe but it is not possible to tell the quality or suitability of these things without a detailed examination.
There is no way of telling the steel thickness for instance or the probity of the welding and there are many sets of headers sold that have cracking issues after a short period of time.
Tubular headers of the type above would be a big mistake on a 300 bhp car and you will find that the spool point increases substantially, probably by 500 rpm and you will have less torque. This is because the designer / manufacturer doesn't understand what he is doing and the requirements of a turbo charged engine.
This bit is both contradictory and bollocks :
For your application properly ported OE headers with matched uppipe are your best and most cost effective option for the gains you can achieve.
There is no way of telling the steel thickness for instance or the probity of the welding and there are many sets of headers sold that have cracking issues after a short period of time.
Tubular headers of the type above would be a big mistake on a 300 bhp car and you will find that the spool point increases substantially, probably by 500 rpm and you will have less torque. This is because the designer / manufacturer doesn't understand what he is doing and the requirements of a turbo charged engine.
This bit is both contradictory and bollocks :
•THE UP PIPE SUPPLIED IS A LARGE BORE DE-CAT PIPE TO GIVE MAXIMUM EXHAUST VELOCITY TO THE TURBO
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16 August 2011, 09:44 AM
#8
Hi Harvey
Do I need to have the up-pipe done? I'm really not after power.
Do I need to have the up-pipe done? I'm really not after power.
From the photo the headers above look OK with the exception of the uppipe but it is not possible to tell the quality or suitability of these things without a detailed examination.
There is no way of telling the steel thickness for instance or the probity of the welding and there are many sets of headers sold that have cracking issues after a short period of time.
Tubular headers of the type above would be a big mistake on a 300 bhp car and you will find that the spool point increases substantially, probably by 500 rpm and you will have less torque. This is because the designer / manufacturer doesn't understand what he is doing and the requirements of a turbo charged engine.
This bit is both contradictory and bollocks :
For your application properly ported OE headers with matched uppipe are your best and most cost effective option for the gains you can achieve.
There is no way of telling the steel thickness for instance or the probity of the welding and there are many sets of headers sold that have cracking issues after a short period of time.
Tubular headers of the type above would be a big mistake on a 300 bhp car and you will find that the spool point increases substantially, probably by 500 rpm and you will have less torque. This is because the designer / manufacturer doesn't understand what he is doing and the requirements of a turbo charged engine.
This bit is both contradictory and bollocks :
For your application properly ported OE headers with matched uppipe are your best and most cost effective option for the gains you can achieve.
16 August 2011, 12:31 PM
#9
If the uppipe is blowing you MUST replace it.
Cheap option is secondhand uppipe, Classic or New Age STi with no CAT £25. Alternatively, a new purpose designed uppipe, stainless steel, slip jointed, DEI heat wrapped with five new Subaru studs £139.
Postage in both cases is £12.50 and fitting if we did it would be £75 in both cases.
Cheap option is secondhand uppipe, Classic or New Age STi with no CAT £25. Alternatively, a new purpose designed uppipe, stainless steel, slip jointed, DEI heat wrapped with five new Subaru studs £139.
Postage in both cases is £12.50 and fitting if we did it would be £75 in both cases.
16 August 2011, 01:44 PM
#10
If the uppipe is blowing you MUST replace it.
Cheap option is secondhand uppipe, Classic or New Age STi with no CAT £25. Alternatively, a new purpose designed uppipe, stainless steel, slip jointed, DEI heat wrapped with five new Subaru studs £139.
Postage in both cases is £12.50 and fitting if we did it would be £75 in both cases.
Cheap option is secondhand uppipe, Classic or New Age STi with no CAT £25. Alternatively, a new purpose designed uppipe, stainless steel, slip jointed, DEI heat wrapped with five new Subaru studs £139.
Postage in both cases is £12.50 and fitting if we did it would be £75 in both cases.
17 August 2011, 09:44 AM
#12
Yes if you read my post I don't know who ported them and someone told me you can run into issues if not done correctly. They have not been fitted to my car before and I don't have in my possession my original headers as my so called mechanic friend done me over.
Considering the price of porting and wrapping and the fact that I am not after big power, I will just stick some standad O/E headers on which I found some for around £20.
Considering the price of porting and wrapping and the fact that I am not after big power, I will just stick some standad O/E headers on which I found some for around £20.
17 August 2011, 10:40 AM
#13
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Yes if you read my post I don't know who ported them and someone told me you can run into issues if not done correctly. They have not been fitted to my car before and I don't have in my possession my original headers as my so called mechanic friend done me over.
Considering the price of porting and wrapping and the fact that I am not after big power, I will just stick some standad O/E headers on which I found some for around £20.
Considering the price of porting and wrapping and the fact that I am not after big power, I will just stick some standad O/E headers on which I found some for around £20.
J.
17 August 2011, 12:31 PM
#15
Engine Specialist
The headers above are Williams Motorsport headers, which are being run on the test car in the link below in my signature. Have a look, they made a very big difference. I agree with Harvey, we are going to test a small bore up-pipe to see if the spool is increased, but at the moment on the road full boost is had between 3000-3500rpm, which is very good regardless of bore size.
Well recommended for £200!
Hope this helps,
Graham
Well recommended for £200!
Hope this helps,
Graham
17 August 2011, 12:54 PM
#16
The headers above are Williams Motorsport headers, which are being run on the test car in the link below in my signature. Have a look, they made a very big difference. I agree with Harvey, we are going to test a small bore up-pipe to see if the spool is increased, but at the moment on the road full boost is had between 3000-3500rpm, which is very good regardless of bore size.
Well recommended for £200!
Hope this helps,
Graham
Well recommended for £200!
Hope this helps,
Graham
Sometimes people just see the word ebay and think crap. May wait for the outcome on the testing. Keep me updated.
26 August 2011, 12:38 PM
#17
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So what headers and up pipe would be the best choice to go for when running with a vf36. I have a standard wrapped uppipe and twinscroll headers i was told they were ported by the guy who sold them to me. Heastshielding is loose on the headers and a lot of rust on them, so i dont think they are in the best condition. Would the GT spec headers and up be the best choice ?
Sorry for thread hijack!
Sorry for thread hijack!
26 August 2011, 01:12 PM
#18
So what headers and up pipe would be the best choice to go for when running with a vf36. I have a standard wrapped uppipe and twinscroll headers i was told they were ported by the guy who sold them to me. Heastshielding is loose on the headers and a lot of rust on them, so i dont think they are in the best condition. Would the GT spec headers and up be the best choice ?
Sorry for thread hijack!
Sorry for thread hijack!
Jura
26 August 2011, 01:41 PM
#19
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unless you planning on going over 400bhp, Harveys ported headers and upipe are ideal. If you end up going even higher then he also does Tubular headers and a different upipe which is suited to that spec
26 August 2011, 02:50 PM
#24
Jura
27 August 2011, 07:59 AM
#25
The first couple of cars we saw with twin scroll, all these years ago, did show gains from porting the headers and uppipe. However I concluded there was a change in production after the first batch of cars were produced because the design and quality of the uppipes improved to the point that any gains were then small.
If I had a twin scroll car I would not remove the headers specifically, just to port them but if they were already off they could be tidied up for not a lot of effort. The work required and gains achieved on twin scroll is negligible compared to O/E cast headers on conventional turbos.
If I had a twin scroll car I would not remove the headers specifically, just to port them but if they were already off they could be tidied up for not a lot of effort. The work required and gains achieved on twin scroll is negligible compared to O/E cast headers on conventional turbos.
27 August 2011, 08:26 PM
#27
Engine Specialist
Went straight on with no modifications needed, genuinely. I'll be honest, I was skeptical as to whether they would be that much better than the originals and they blew me away!
Graham
Graham
31 August 2011, 11:24 AM
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Was the up-pipe decatted at the same time as the new headers were fitted or had it previously had an up-pipe decat?
31 August 2011, 12:08 PM
#29
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This is one of the mods I most regret. Being talked into GT Spec headers which I also had ceramic coated for extreme £££££, when all I needed for the BEST benefit to my car was the OEM headers porting and the up pipe changing. I have spent a lot of time since trying to get the best out of my car, including visiting Harvey and Bob Rawle, etc.
So, forget it and stick with ported OEM, one of Harvey's matched up pipes, a remap and enjoy! LOL.
So, forget it and stick with ported OEM, one of Harvey's matched up pipes, a remap and enjoy! LOL.
31 August 2011, 12:45 PM
#30
The manifold to up pipe flange in the ebay link look like the 2 bolt jobbies ..... mine wouldnt hold a gasket in there for any length of time and is now welded solid! Only a matter of time before it cracks and i get onto harvey for a decent replacement!
The saying "Buy cheap, buy twice!" has bitten me in the @ss more than once and a cheap manifold was no exception!
Its no wonder anyone running reliable decent power has a 3 bolt uppipe or ported oem headers!
The saying "Buy cheap, buy twice!" has bitten me in the @ss more than once and a cheap manifold was no exception!
Its no wonder anyone running reliable decent power has a 3 bolt uppipe or ported oem headers!