Blinx's Official Exhaust Manifold (Header) thread.


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someone's about to get a warm bum:rolleyes:, this is purely thread for learning not for spamming! i would say this post belongs in a different thread, read the first page! :nice:
 
wicked thread! now im really confused what to do!!!
i was a new mani.. i have 4-1 and its fubared, just like blinx described. but im not forking out an extra £150 for 4-2-1 :(

surely not ALL 4-1 headers fit like ****

any ideas?
 
Awesome read Blinx.

Just wanted to get your opinion on the header that's in my EK9. It's made by a company called Thundersports. Can't really find much on their products apart from their site. The header is a 4-1 type but the primaries meet roughly halfway down the block and then it's just a single pipe down the rest of the block and under before going into the cat. I'll get a picture for you when I get home from work :nice:
 
Very very good read up man, gives the average joe a great understanding of what he or she wants! I want an SSR streetsweper :D
 
Apologies if I'm not allowed to post on this thread. I'm just after some advice and some technical help.

I've recently had a full 2.5" system made and the 4-1 ITR manifold that's on has been altered to a 4-2-1 because the car was very Subaruesque in noise.

Unfortunatly the alteration has not got rid of the Scooby engine type note and I believe this is down to the runners not been the correct length, also the guy that's done the work has paired tubes 1 & 4 together and tubes 2 & 3 together.

I've been told that it should be tube 1 paired to 3 and tube 2 paired to 4, is that right?

I'd also like to know what primaries and secondaries are just so that I have a better understanding.

Are primaries the main tube i.e the big tube that runs from where it's bolted on right the way down or are they something else?

I'm quite confused by it all tbh. Here's some pictures of the header for you to look at if it's any help. It looks almost as though mine is a 4-2-2-1 header doesn't it?

IMG_20130418_104124_zps57d20088.jpg
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this way is the usual way to connect the cylinders, as this gives an even spread in the exaust pulses.
i have notised that a lot of b series manifolds are paired other then that, and even though it goes against all theories i have ever read, it seems to work.. anyone can shed some light on the theory behind it?

best guess myself is some bargain between the 2 cam profiles wich affects the lenght on the primaries..
 
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