i am thinkin of puttin a new header on my 07 2.2 and was wondering what the difference would be between the shorty and the mid hp gain wise... is one better than the other? im not sure what the difference would be? any help would be appriciated. Thanks...

 

i have the zzp midlength with the megan racing exhaust... and i love it... its a nice low rumble at idle and then when i get on it its loud...

hoenstly i think the midlength would be the better call.. i can tell my car pulls harder now...

 

The shorty will give you more gains high in the power band, while the mid-length will give you gains in the mid range. Its your call where you want your power band to be. It won't be too big a difference though and either one is much better than the stock manifold.

 

so since i have the 2.4 mani swap on my car i should go with the mid right? and if i do that is there any mid length out for our cars that bolts up to the stock down pipe? i plan on replacing that as well but just not at the same time...

 

you cant buy the ZZP midelngth header without the downpipe...its a combo piece

 

no, a midlength will not bolt to the donwpipe without cutting and welding.

 

Thats still up to you. If you want to get the most peak hp out of your car and maximize the 2.4 manifold at the high rpm's, go with the shorty. If you want to balance the power a little bit more between mid and high, go with the midlength.

As far as I know, only shorties can bolt right up to the stock downpipe.

 

i thought it was the other way around, that a mid would help more with the high end.


though i admit im not really familiar with the differences caused by mid vs shorty.
anyone know any good places to read about that?

 

http://www.carcraft.com/techarticles...ics/index.html
thats jsut one, theres lots around, jsut search header theory or something in google, I ve also found equations for deciding what size primaries to use based on your displacement and at what rpm you want peak torque

 

i really dont do anything more than run a 1/4 mile on the weekends so i think a shorty would do just fine. it shouldnt mess with any of the daily driving that i do right? i dont really drive all that fast anymore. too many tickets

 

A shorty header will serve your purpose just fine, and drivability will only improve.

 

ok. well when i get my income tax check back i will purchase one and install it then im off to the track!

 

4-1 short will be the best at flowing air at high RPM's and a 4-2-1 long tube will provide the most low end torque but not flow as well in the upper RPM's. Take your pick.

 

i dont understand this. i would think the only difference would be that in a long tube, there is a lot more surface area on the headers helping the exhaust cool and condense, which would free up space allowing more to flow easier at all RPMs. of course this would in tern reduce scavenging abilities, lowering you low end power, while raising high end power due to your now greater flow.

im open to learn, cause i have no clue if the above is correct, but its the only thing that makes sense in my mind

 

I don't have my notes from Wyotech here at work as to the reasons, I just know thats how it is. I'll post something later.