Does anyone make a 2.5in header for the 22re or would i have to have it custom made?

 

why would you want one that big ?

 

if your talking about the Collector then yes...most all are 2.5" i believe

if your talkin about primaries then NOOO..lol

 

because the bigger it is the less restriction youll have and nomatter what size pipe is after the header if its bigger than the header its wasted money because it dont help none. but no im talken bout the primaries

 

2.5 is a bit big, imho

 

2.5" is too big......

so unless you want less horsepower go with what's available

 

this guy probably has a 3'' exhaust and wonders why it has no power

 

Careful, bigger isn't always better!

Sometimes going too big can create too large of a pressure differential between the exhaust header and the cylinder causing suction in the header that will actually force unburned fuel to flow into your exhaust system during valve overlap, thereby reducing power, fouling your 02 sensor and ruining your CAT.

You want the right header not the largest header.

 

You want 2.5" primaries? Is your 22RE making 1500hp?

I agree with Kiely, you want the right header, not the biggest one. "Little" 1.625" primaries are about as big as the most heavily built 22RE will ever need and the average 120hp 22RE will be happier with 1.5" primaries.

 

just run no headers at all high flow and kick ass sound!!!

 

the only reason i was thinkin i would wont one that big was because i want either 2.5 or 3in exhaust all the way back. I dont have a catalic converter on the truck either.

 

lmao are we getting punk'd

 

*subscribed*

 

If I was you I'd search and don't tell me you have cause I did alot of it before my exhaust went in. look up scavaging exhaust and back pressure. If you get it wrong you lose power. Good luck

 

Dude don't do it. I had a 2" made for mine and 2" exhaust run all the way back and a burnt valve later I replaced it with the stock setup. A little bigger than stock won't hurt but too big is a bad thing.
Also, what exactly are you trying to get out of a bigger exhaust?

 

you want a REAL free flowing exhaust?

nothing beats this:


[YOUTUBE]http://www.youtube.com/watch?v=CLYi4JDnTSQ[/YOUTUBE]

 

okay... I'll bite.

I'm sure headers have been discussed ad nauseum but I'll reiterate my humble understanding.

Your exhaust manifold/header is more than just a tube that diverts exhaust out from under the hood. Properly designed a manifold or header can use the significant energy that is left over from the combustion stroke to improve the performance of the engine.

1. It can reduce the loss of power from pumping the exhaust out of the cylinders even lower than if the exhaust were completely open.

2. It helps to scavenge the cylinder so that intake gases are not contaminated with left over exhaust gas. (again better than an open exhaust)

3. It can actually pull more intake charge into the cylinder by starting the flow of intake gas into the cylinder during the valve overlap period.

It does this by using the timing of pressure waves in the headers.

When the exhaust valve opens it create a pressure wave that moves down the primary tube of the header. When a pressure wave in a tube hits an expansion in the tube (Like the collector at the end of the primary tube) it creates a rarefaction(suction) wave . This 'suction' wave travels back up the tube to the exhaust port. If you get the timing of this wave right it will accomplish numbers 1, 2 and 3 above.

The primary tubes have to be large enough to allow optimal flow of exhaust gas out of the cylinders but if you make them too large then they don't maintain the strength of the compression and rarefaction waves and you loose your scavenging. The collector also has to be the right length and diameter to provide optimal use of the rarefaction wave.

So not only do you want headers with the correct diameter primary tubes and the correct diameter and length collector but you don't want to throw on a 3" exhaust after the header because you will then introduce another rarefaction wave that will interfere with your headers design. Bigger is not better!

I'd stick with a well designed header like Thorley's tri-y or LC Engineering and mate that up to a 2" or 2.25" exhaust. IF you are really ambitious you can buy software that helps you design headers and you can build your own. The stock exhaust on the 22re is really pretty good. I'm guessing the only reason Toyota didn't do the header is cost, possibly noise and reliability.

 

http://www.downeyoff-road.com/Engine...stSystems.html

 

downey is expensive but all im looking for is a few ponys and a deeper tone. and a better look.

 

are we talking about a honda or a toyota pickup...?