F22A4 header better than A6 header why?

[AndrewNe]

in the thread gain 30 hp for 500 dollars or less it says the A4 header is way better than the A6 but why? wouldn't they put the better header on the better engine which is the A6 right?

Or am i just lost totally?

[92accordcb7ex]

the one on he a4 might be a little better im not too sure but dont i maybe wrong but i think most of the power difference in the a6 comes from the intake manifold so.

[visualpoet]

There is debate about which header flows better. The a4 is a welded tubular style, while the a6 is a cast manifold. The flow difference is probably negligible. The a6 got it's extra ten ponies throught the better intake manifold(it had secondary runners for more airflow at higher rpms) and a slightly wilder cam.

[EJX_Michael]

The a4 header is tubular, much like a "performance" header, Where as the a6 is cast iron.

Im not sure why they would perform any different, But if your going for stock, the a4 looks better...

Edit: Dang it John!

[AbsurdNY]

The a4 header is tubular, much like a "performance" header, Where as the a6 is cast iron.

Im not sure why they would perform any different, But if your going for stock, the a4 looks better...

Edit: Dang it John!

The reason why the A4 will outperform the A6 is because the inside of the tubular header of the A4 is much more smoother then the inside of the cast A6

[Leung]

also doesn't the casted manifold weigh more than the tubular one?

[AbsurdNY]

also doesn't the casted manifold weigh more than the tubular one?

Yes I believe you are right.

[krb92accord]

So a4 or a6, manifold or tube type?

I have a chance right now to replace my old cracked a1 manifold and would like to know which one would be better to go back on my a1?

[JoshM]

I have a chance right now to replace my old cracked a1 manifold and would like to know which one would be better to go back on my a1?

a4.

[lonski]

If your coming from A1, make sure you have a matching downpipe for the A4, coz A4 is 4-2-1 whereas an A1 is 4-1-1.

[ExplodingCake]

Why even bother changing when you will only gain 0.05 HP which does not make any performance difference at all?

[guitarplayer825]

If you read the post his stock a1 manifold is cracked and he needs a new one so why not just get an a4 header?

[lonski]

Why even bother changing when you will only gain 0.05 HP which does not make any performance difference at all?

I agree, coz going from A1 to A4 is a bit of work, the downpipe in particular. If the bolts on the cat & downpipe are siezed, you don't wanna mess around with it. Unless you plan on replacing the cat as well.

[AndrewNe]

So A4 is the winner then?

And if you take the A6 intake manifold it activayes the secondary runner in my A1?

[lost_accord]

And if you take the A6 intake manifold it activayes the secondary runner in my A1?

No - The A6 manifold HAS secondary runners. Your A1 does not.

So if you put the A6 intake on your engine you will have secondary intake runners and more power. Have fun.