818/323/213 Bi-Monthly Meet -->Downtown Los Angeles<-- **10/07/10**
sadly auto. Thanks a lot bro
I have the intake for years now so i think headers should come next to..
well if you're planning on going all out then def get headers first while the motor is being put in cause the install for headers once everything is done is going to be a PITA and you're gonna end up paying an arm and a leg for install on headers. If not start off with Plenum spacer, K&N drop in + Z-tube, and test pipes, that can be had for ~$600, then you could find a used HKS or something for around $600, after that TUNE!!! All these mods are pointless w/o a tune, right now im running lean cause i have all the breather mods but once i get a tune its game over 

So far the set up your saying sounds really good bro.
First off, headers aren't cheap. Secondly, it costs an as* load to get them installed. Thirdly, your budget is $1200. You'd be better off getting the items both Shane and I recommended before even bothering with headers. On top of that, they don't provide that great of gains on the DE motor to make it even worthwhile, especially considering the price for parts & labor.
However, if you DO plan on getting as much out of the motor as you can, then you might as well get the headers while the motor is out along with all the other mods listed, and then tune that bitc* to achieve the motor's full potential.
EDIT: About the manifolds, considering the fact that you have a 5AT (non Rev-up motor), you'd be just fine with the plenum spacer. The MREV2 is specifically for Rev-Up motors.
However, if you DO plan on getting as much out of the motor as you can, then you might as well get the headers while the motor is out along with all the other mods listed, and then tune that bitc* to achieve the motor's full potential.
EDIT: About the manifolds, considering the fact that you have a 5AT (non Rev-up motor), you'd be just fine with the plenum spacer. The MREV2 is specifically for Rev-Up motors.
Just a run down on prices for the items if you get them used:
Ztube - $50
K&N/Amsoil - $25-30
Stillen Intake - $100
FI HFCs - $350-400, CrawfordZ - $250-300
Test Pipes - $100-150
5/16 Plenum Spacer - $120
Exhaust - ha, anywhere from $400-1000
HR Y-pipe - $100
don't forget a tune
Ztube - $50
K&N/Amsoil - $25-30
Stillen Intake - $100
FI HFCs - $350-400, CrawfordZ - $250-300
Test Pipes - $100-150
5/16 Plenum Spacer - $120
Exhaust - ha, anywhere from $400-1000
HR Y-pipe - $100
don't forget a tune




), hfcs (crawfordz/fi) or test pipes for more power, fi or motordyne exhaust and a tune
