Hey,

I kind of feel stupid asking this as it should be a known answer but I'm hoping to find the opposite of what I think.

I am trying to find a 2.5" or anything larget than 2.25" basically header or exhaust manifold (non turbo) for the ECOTEC. I would like one that is 50 state emissions legal and preferrably a tri-y setup 4-2-1.

I am in the beginning stages of putting together an exhaust setup on my car but I want it to be 50 state legal none of this having to go to outside stations just to pass inspection. The goal is to build a 100% street legal cavy.

None that I know of. You are going to need a strong N/A build to need the 2.5" tho. To me, it's just to big. The pacesetter's collector is 3" but the downpipe is 2.25", So you could have one made but that would cost a bit.


2012 HD VRSCF
2010 Ford Explorer
2006 Ford Ranger
2004 Chevy Cavalier

Well this isn't an N/A build though that's the reason i wanted 2.5" The car is supercharged. I can currently feel how restricted it is, and I ended to put a smaller pulley on plus port the head so I was going to set it up for 2.5" air flow. That's why I wasa trying to find one. Thanks for the help.

I'm running the Pacestter header with a custom made down pipe thats 2 1/2 inches.
Like Fire Fighter said the collector is 3 inch so its probly your best bet to do what I did and have it made.




Semper Fi SAINT. May you rest in peace.

pacesetter's is the only 50 state header at this time


and like jackalope said just get a down pipe made in 2 1/2"


i can tell you im still using the 2 1/4" and full 2 1/4" piping on my 2.4 s/c , and i still have not exceded the exhaust size , and dont plan on any size changes yet , and i see around 9 psi on a cold night with the alky injection


i know alot say 2 1/2" , but ive been happy with the 2 1/4"

oh and i forgot , you want a less restrictive header with the s/c , which means a 4-1


there is way to many bends on the 4-2-1's out there

Ok, didn't know the car was s/c'ed. I saw the non turbo and thought you meant no boost. Check around at some local exhaust shops to see about a downpipe.


2012 HD VRSCF
2010 Ford Explorer
2006 Ford Ranger
2004 Chevy Cavalier

Maybe this will work for you.

Here's an expensive 4-2-1 with few bends. They will only sell it with the catalytic converter attached. (legal stuff - read on their site for details)

There's more good info on this page.

From http://www.iperformance.biz/header/facts.html

Only Iperformance offers exclusively Tri-Y design headers.

Other manufacturers offer 4-1 headers, not because they provide better performance, but because these headers are cheaper to manufacture and offer much greater profit margins for the manufacturers of these products.
4-1 headers typically loose a lot of low end and mid range torque by their design. The 4-1 design will show a single peak in power improvement with a sharp decrease in power both above and below the single peak, when compared to the stock power level. Most header makers using this design will tune for peak horsepower at or above the engine's maximum speed, loosing power through the lower half of the power curve for a very small gain at maximum engine speed. However, the exact point in the RPM range at which that peak occurs is determined by the diameter and length of the primary pipes, and some makers will use longer and smaller diameter primary pipes which will result in a small peak in power in the mid to low RPM range with power loss at both very low RPM and across the upper half of the range of engine operating speed.
Tri-Y headers produce even power across the entire RPM range with very noticeable improvement in mid and low range torque. This is because the Tri-Y design produces two separate peaks in power gain which taper off more gradually below the first peak and above the second peak, most often not showing any dip below the stock power level. Where those peaks occur in the range of engine speed is determined by the diameter and length of both the primary pipes and also the secondary pipes. Most makers of headers with this design will tune for the first peak in power in the lower half of the engine's operating speed and the second peak in the upper half of the engine's operating speed, for an even and consistent improvement in power across the entire range of engine speed which will in all cases out perform the 4-1 design for both street and race use.
Iperformance uses only Tri-Y headers because this design offers the best performance, period. Tri-Y headers are more expensive to manufacture because they are more difficult to build with more labor hours per unit and more complicated assembly, but the difference in cost is more than outweighed by the difference in performance, and we offer only the best.


Click this link for the header: http://www.iperformance.biz/header/ecotec.html






Keith.
2003 Z24 Auto.
16.125 @ 84.42.

the iperformance header is pure sex... but you could buy 4 pacesetters for it costs.

quite honestly, a 2.25" exhaust will be fine, even with my bolt on crazy 2.4, I gained 3 tenths in the 1/4 by going from a 2.5 rear exit, to a 2.25 side exit.

Thank you keith I will go with that product. Talking to them now about an enhancement that I would need for my setup.

Owen thanks for the advice and you have to keep in mind that I am boosted. And at the same time of the exhaust that I will be porting the head out, so the extra flow will be useful. On an N/A car I even felt that the 2.25" was slightly to much but seemed to fit better performance wise than the 2.0".

Do you have cams yet that are for a supercharged ECO ? If not your missing out in sooo
much! You thought it was fast now? HA! Slap in some new cams especialy ground for a blower and watch out!




Semper Fi SAINT. May you rest in peace.

spray the sh!t out of the Stan's exhaust with aluminumizing paint if you get it - d/t living in the NE. I got the ceramic coated header and its rusting and my cat went after only 2 and a half years (mostly before the head/cam debacle) and the entire exhaust (after the header collecter) rusted to nothing...I would go stainless, though it was quite expensive... Since I had to replace the Stan's stuff (had the whole exhaust) and had to get a new pipe bent for over the axle. I would go with the ceramic coated pacesetter and get the rest fab'd up

off post: how's the car running with the supercharger on for a while now? As soon as they confirm it can be installed on '02's with Delphi's, I will be getting it installed...


_
2002 LS Sport coupe