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Lonely_Driver | Posted: Jun 24 2012, 01:13 PM |
IDW Supremo Member Group: Advanced Members Posts: 870 Member No.: 38,019 Joined: Oct 24th 2011 Location: Update Profile | So I'm in the market for a new header for my Legacy since all the stock heat shields are rattling like a mofo and I cant be bothered to work on it without upgrading. One of the most popular options for us is to port and polish the stock manifolds. Now inside the pipes are weird steps, and it always made me wonder why Subaru did this, there has to be a reason why they are cast this way, so I did some research and it has something to do with the firing order and to help the exhaust pulses and such. Also the stock manifold diameter is a perfect match to the cylinder head and turbo exhaust inlet, only the gasket size is bigger for some reason. Anyways I'm still set on buying a EL header but most of my knowledge on the subject is all from NA designs which I found out lately is totally different when you are turbocharged. I was hoping to hear some input from the rest of you guys with different platforms to see what others are doing to decrease spool up time and keep pressure in the exhaust system before the turbo. Here's what Ive read regarding Subarus on the subject. (copy pasted my post from WSC) Starts at post #15 http://forums.nasioc.com/forums/showthread.php?t=2271466 Found another one too, stock manifolds are already an exact match to the cylinder head. http://www.iwsti.com/forums/gd-exhaust/170...ld-porting.html Another good post by KillerB http://forums.nasioc.com/forums/showpost.p...87&postcount=26 (KillerB makes the best header for single scroll Subaru's, its called the Holy Header) |
s12drifter | Posted: Jun 25 2012, 01:29 PM |
The Lulz Boat Group: Advanced Members Posts: 1,363 Member No.: 23,696 Joined: Mar 21st 2007 Location: Update Profile | i dont know what you subbies do but a lot of times us Z31 people ceramic coat the manifold heat wrap and heat shield lol. |
sideways | Posted: Jul 2 2012, 02:46 AM |
We're the People's Front of Judea! Group: Advanced Members Posts: 13,123 Member No.: 1,355 Joined: Feb 28th 2004 Location: Las Vegas, Nevada | Not a fan of header wrap on street cars personally. But im also not a fan of exhaust leaks |
HorizontalMitsubishi | Posted: Jul 2 2012, 04:10 PM |
Part of the Tessou Signature Series Group: Advanced Members Posts: 2,439 Member No.: 2,022 Joined: Jun 16th 2004 Location: Torrance California | Crystallized headers tend to not seal very well. |
SolidSTI | Posted: Jan 3 2013, 05:48 PM |
IDW Member Group: Members Posts: 11 Member No.: 39,236 Joined: Nov 6th 2012 Location: Louisiana | Unless you are going with swaintech coated killerb headers go with ported subaru factory manifolds. Many of us, myself included, have tried the various aftermarket solutions to wind up with a cracked header. The EL vs UEL debate is like beating a dead horse. EL will get you maybe 300rpm lower in spool. It is hard to compare since tuners could have just enriched the bottom end. |
chillined | Posted: Jan 11 2013, 07:52 PM |
IDW Goldmember Group: Advanced Members Posts: 1,470 Member No.: 23,552 Joined: Mar 10th 2007 Location: In the great snowy areas | The only thing is, equal length headers not only increase spool time but overall power throughout the whole rev range. |
RedsunsF1 | Posted: Jan 11 2013, 10:22 PM |
Nasa UT | FF FK8 Group: Advanced Members Posts: 865 Member No.: 38,401 Joined: Feb 29th 2012 Location: Salt Lake City, UT | I would stay with the oem headers honestly for a DD. You might have known this already about equal length headers but i'll still say it, if you go equal length headers you will lose the rumble sound of a Subaru. |
chillined | Posted: Jan 12 2013, 12:34 AM |
IDW Goldmember Group: Advanced Members Posts: 1,470 Member No.: 23,552 Joined: Mar 10th 2007 Location: In the great snowy areas | I'll be going with equal length headers on my GM6, thanks. I don't need to have that rumble sound, because every other freakin' Subaru has it. |
sometrueno | Posted: Jan 22 2013, 01:36 AM |
◆フェアレディZ POWER◆ Group: Advanced Members Posts: 976 Member No.: 11,599 Joined: Aug 28th 2005 Location: Update Profile | i didnt read your post but whatever you do, get unequal length for cool noises |