no, it won't be noticable.

I don't know about that...

Hard to say I guess. But think in a full size engine, just polishing the ports helps with power.

I'm not saying not to run it with that header, I'm just saying if it's a good engine and you plan on using it, you may as well spend the $5 or whatever for a matching header to have the engines full potential.

All i'm saying is that if he's got a Cen with a little .16 he wont' notice. if he was running a high end off road car with a crazy hand modified .12 and had a mismatched exhaust port, he'd probably notice.

The standard cen pipe is dual chambered and has 2 outlets (like a twin pipe). On all other cars I have seen, they just have a single outlet and when I opened my kyosho pipe it had a single cone. Why is this 2-chamber pipe better, and if it was, why dont all manufacturers adopt this.

I don't know the science behind it (something to do with resonance pressure waves....) but a dual chamber pipe is better than a single chamber pipe (or muffler). I think they produce a wider range of pressure waves having two chambers, so the ideal backpressure is supplied to the engine at both ends of the throttle range. It may even be that one of the cones has more of an effect at low revs, whilst the other helps the engine when it's revving higher.

I think the number of outlets, or "stingers", is purely for looks as none of the high-end pipes have them. Mufflers and single chamber pipes (i believe you can get single chamber tuned pipes, although i've never seen one...) are used simply because they are cheaper than the 2-chamber tuned pipes and mufflers are much more compact.

EDIT - This is just based on what i've seen. I could be (and probably am) completely wrong.

dual chamber pipes vs single chamber pipes depends entirely on WHERE you want to make your power. some engines work better with a single chamber, some work better with a two chamber.

Just to cut through the misunderstandings about tuned pipes in this thread.......
A tuned pipe always consists of a header + divergent cone + convergent cone + stinger. That's the tuned part!

2 or 3 chambers is a confusing term and I think it just has to do with the muffler part. Europe now only allows 3 chamber pipes because they are less noisy.
From what understand a 1 chamber pipe is just the tuned part. No muffler.
A 2 chamber pipe is the tuned part + 1 stage muffler.
A 3 chamber pipe is the tuned part + a 2 stage muffler.

[link=http://en.wikipedia.org/wiki/Expansion_chamber]Here is the link.[/link]

hmm - so my 1 chambmered kyosho pipe (i.e just has one cone in it) will be much louder than if I buy a stock cen pipe, which is dual chambered..

I have no clue what your pipe looks like or who said it was a 1 chamber pipe. I was just posting what I think it means and what the tuned part of a pipe actually is. The rest is (hopefully) a qualified guess. Nobody I've asked seems to actually know what it means. All I hear is repeats of what a sale broshure says..... if you get my drift.

You say your pipe only has one cone. Does it come apart so you can see it? Just wondering.

hmm - so my 1 chambmered kyosho pipe (i.e just has one cone in it) will be much louder than if I buy a stock cen pipe, which is dual chambered..

If you only have one cone and muffler element it will not necessarily be louder. So yeah 1 cone + muffler element will technically be enclosed in one chamber.
(Two cones and no muffler will also be one chamber. Do you see what I'm getting at?)

How do you know it's only one cone?

because i took it apart..