Hi fellas, I am about to build a set of extractors for my rig as the old ones are really rusty and a new set of painted steel ones from the exhaust shop here cost $330!
I want to build these ones out of stainless. no more rust!

I was planning on building an equal length 4 > 2 > 1 as I am of the impression that they utilise the effect of the negative/low pressure created after each exhaust pulse passing through the pipes?

For those that arent familiar with this concept I drew a basic diagram of how I understand this effect to work, but If I am wrong then please correct me:




Red path is positive exhaust pressure pulse travelling down pipe.

Blue path is negative (or low) pressure created from the passing of the high pressure exhaust pulse.

Using this design the negative/low pressure pulse "pulls" the next pipe's positive pulse through the first Y collecter.

Then each pair of Y's collects again and the effect is repeated through the 3rd Y, thus 'pulling' through each of the first Y's.

Is this correct?
I was of the impression that this makes the Tri Y design more effecient.

maybe you can shed some light Jmac?