can you read?.. no you dont need back pressure

its myth anyway theres no such thing

Last edited by chris sieclay on Fri Sep 16, 2011 2:26 pm, edited 1 time in total.

You just said "needs" back pressure

Maybe it was just poorly worded. I just don't see the words "restriction" or "back pressure" as being conducive to explaining exhaust systems as they are never interpreted the right way.

yes i worded that way cause thats the first term people use, its a myth.

Totally agree with you skidder, i built headers for a major manufacturer here in adelaide for 8 years.

Have u considered how much its going to cost you versus the gain your going to get???

Cheapest high flowing muffler would be Lukey

i got a 3 inch on my na6 el for $550 with one muffler.. had to custom make the centre section and got the tale pipe off the shelf... sounds good but probs is a bit loud... project car anyway so dnt really care

I've got a full 3" defilippo exhaust with two mufflers for sale if your keen. Only done about 5,000k and was on my turbo EB.

Same goes for you.

You have both just posted utter usless crap, and any one that reads it has just become ever so slightly stupider for it.

There is far more to it then I quite frankly have the patience to sit here and explain to people that currently have such a poor understanding of it.
There is plenty of good literature and practical experience to be found if you spend the time to look for it. ALL of it far better then you will learn from a few 50 year old mechanics that have 30 year old advice to give.

But to give you a head start on it all. The power is made by the headers, and that doesn't you jam a short 3 inch long collector on the end of the secondary pipes and call it a job done.
The rest of the exhausts job is ONLY to provide a means of removing the exhaust gases to a suitable location. That job needs to be done with ZERO restriction over the entire operating RPM.

If you want to fill in the blanks you need to do you're own research.[/quote]

Man your a total wanker tickford 6! So exhaust does not affect power its only the headers? Well i think you need to come back with some better knowledge

Tickford 6 i have met many people like you in the trade, total know-alls that apparently know everything and don't like taking advice from people that have more experience your what we call a total wanker. So you know more then a performance engine builder of over 30 years do you? i don't think so mate!

What's utter crap you wanker?

Most of what i wrote was out of one of my exhaust text book, so it is fact.

If what your saying is true then we wouldn't need an exhaust, how untrue is that have you tried driving a 4.0 falcon with just headers and no exhaust? Well i have, car was so gutless barely made it up a hill

Well an NA falcon running 13's is more then likely not a roadworthy car. I'm talking about your daily drive a car that is driven on the streets not a drag car. Yes if you built a hardcore engine that does 13sec 1/4 mile then 3" exhaust is not overkill at all but don't twist my words, fitting a 3" exhaust to a daily driven falcon is just stupid it will just end up annoying your neighbours

Who needs fight music when you can just wake up on a nice Sunday morning and jump on FordMods.

I wish I knew more about exhausts n sh*t.

I wouldn't wanna say something and then get reamed for it.

Anyway OP, I say get a million Varex mufflers and join them together. That way you can adjust every single inch of your entire exhaust.. it will be very very long, but put a nice tip on it and it should be fine, mate. Giggity.

Greggy B

P.S.

Definition of REAM. transitive verb. 1. a: to widen the opening of (a hole)

You've taken Tickford 6 out of context.. and he does know what he's talking about.

No need for name calling.

The difference between you and me is I go by personal first hand experience. You go by reading texts books and believing anything that other bloke tells you. ( he's gone from a mechanic on your other post to a 'performance engine builder' in this post????????

You've also come at this whole thread from the wrong angle.
Right from the start it was a thread about a heavily worked engine where the current 2.5 inch system had already been proven to be holding the engine back.
You then realised that after a few days and have now tried to back flip.






Again overly simplistic. ALL current off the shelf headers are a compromised design for fitment to stock to lightly modified road cars. That obviously includes the full length exhaust system.

and just to quote my self..


What that means is pulling the exhaust system off a car with ANY current off the shelf brand name header does NOT equal a properly designed system that will make good power.
What it does mean is that if you talk to some like Burns stainless and give them ALL of the engine info they need they will design a header that works for your engine.

Do a search in here for all the times people have asked about what size exhaust they should get. %99 of the time I have recommended an off the shelf 2.5inch system of what ever brand is the cheapest in persons area. The other %1 has been times like this where the engine will benefit from a larger system.


I have been modifying cars and building engines for probably 12 or so years now, The single biggest thing i've learned is that you don't ask your 'common performance engine builder' about any thing other then SBC and SBF engines. ask any of them about a 6cyl engine and the first thing that happens is their brain switches off and goes into 'those things don't make power mode' and they sprout bull s**t like 'those things only need a 2.5inch exhaust'.

CVE will be making the 3" exhaust for me, it will have a before and after dyno as well. Here is how it sounds at the moment.

http://www.youtube.com/watch?v=dizIKbbDQC4

Will be good to see how much better it goes with the 3" system, even better to see another NA i6 in the 13sec bracket hopefully.

Gotta love the lump to that idle with the cam, sounds mint Gezza!!

+1 for that grumpy as f**k sound, sounds really good for a 6