KBar

I'm building a new 22re but I dont know whether to run header or use the stock exhaust manifold. Which is better for hp and gas mileage?

motocrossaddict223

... I feel like this has been discussed before. Maybe someone could give you a "yes or no" response but you should try searching..

KBar

i searched header vs exhaust manifold and there were 3 pages of bs

motocrossaddict223

ahhh typical ..id say header=better..because it rhymes, haha but seriously the header will be better. Thats why everyone with a 22re has one.....On my 2rz the header with factory exhaust even made a difference, now it has full custom, free flow exhaust and yea, its better.

abecedarian

You didn't say what year 22re you're building so, meh!

In general, the stock exhaust is a good balance between economy and performance. Most 22re are a "tri-y" / 4-2-1 exhaust and it's tuned to be a good all-around system. It has flaws as does every exhaust system ever built whether by the factor or tuners.

More high-rpm power: go 4:1 header.
More mid rpm power: go purpose built tri-y / 4:2:1 header.
Remember to adjust your cam timing for best results.

If you're not changing the cam, porting the heads or something like that, the stock exhaust is a good option.

However, opening the exhaust up after the converter can give some tiny ponies. 2-2.25" pipe after the converter can make things feel a "little" more snappy, or at least that's my experience.

Stu Pidasso

Ted at Engnbldr says run the stock manifold. Some people say run a 2 in to 2 into 1 or what ever, and others swear by the 4 in to 1. I think it is all about what you like personally. Just make sure that any part you buy for your truck is quality. These engines and the trucks they are in are high quality automobiles. So make sure your parts are worthy of the truck. Next what ever header or any other modification you perform, make sure you take the time to do it right. If you cannot afford the good stuff or cannot afford to get what you need to do it right, take your time and wait until you can. Your truck is only as good as the work that is performed on it.

KBar

87 dropping it in my 86

abecedarian

So, given that, the stock manifold is better for mileage and HP.
If you go to any header, you're going to be giving up mileage for HP and then it comes down to where you want your HP to be added. High rpm power is usually favored by 4:1 headers and low grunt is usally where 4:2:1 (tri-y) works good... though it's been shown that a good tri-y can perform as well as a 4:1 header if built correctly. Which leads us back to the stock system.

abecedarian

Oh, and off-topic... KBar, I read your signature and you might get a kick out of Bill Cosby talking about playgrounds (sorry if it shows twice- it's a yotatech thing):
[YOUTUBE]Rqv38fP7cr0[/YOUTUBE]

KBar

funny but my sig is talking about skateboarding, my other passion. My longboard comes first than my 4runner.

85celicagthatchback

the stock ex manifold is great for power in any rpm range the biggest difference is what comes after is if u have a highly lift 4x4 with big ass tires ud want a 2wd down tube it two small pipes that run to the cat and go into one pipe right befor is give u good down low power. now if u want to have power up at higher rpms then go with the stock style 4x4 two in to one right ater the exhaust manifold. but what ever u pick never run a pipe bigger then 2.25 id after the cat u lose to much back pressure and the engine doesnt like it. its actully better for a 4x4 to have 2"id

wyoming9

iTrader: (1)

It all comes down to what you want.

Is the header gonna be legal where you live .

In the olden days when I was swayed by the keep up with the neighbors . One just had to have headers to be cool and hang with the in crowd.

In this part of the great salt belt i was getting on average 2 winters. No matter what I tried

What is the purpose of having a 4x4 if it sits in the garage only to emerge on bright sunny dry days.

I would run into problems company one goes out of business well company two the header was just different enough that support brackets had to be remade and moved pipes were to short but not different enough to fit a length of pipe in.

All in all for me headers were a huge pain in the butt. For a 18 year old to poor to pay attention.

Like I said it is all up to you and what you want!!

Any Horse power gains will be offset by decreased fuel mileage because your right foot is used way to often trying to massage the floor flat.