Just came back from technosquare and my results are in. As many people predicted there was not much gain from these headers in peak gains. However the whole car feels much faster due to the gain throughout the whole rev range. Very usable power was gained and the way the car feels and drives makes me satisfied. I also have pics of the headers side to side with the manifolds that i will post toamrrow. A/F went from 13.4 to 13.5 so not bad. The sound of the exhaust did not increase at all but maybe made the engine noise increase a tad bit. My final consensus on these headers is that they are not worth it for the money/WHP ratio but do not have any negatives to it other than that. If you have the money they are amazing headers but if you are strapped for cash i'd say pass these up and buy something else. To each his own. Anyway here is the dyno. Red line is after install and black is before. Baseline numbers were 293.2 WHP 247.8 WTQ. Now all thats left is your decision on whether these are worth it to you. Enjoy and I hope these help your modding decisions.

EDIT: Temperture and humidity from both days were relatively similar


Stillen Headers Next to OEM Manifolds










-Arsh

 

decent gains. Thanks for posting this.

 

 

Nice. Thanks for the feedback and dyno numbers.

What's next? I'd consider a lightweight flywheel or some 3.9 or 4.10 gears.

 

Does that include a reflash after the headers?

 

I am getting the UR crank pulley installed on saturday and redynoing on tuesday. Can't get a lightweight flywheel cause i have an auto.

And no, this is on the stock ECU with no reflash or tune. After i dyno the UR pulley im going to reflash and tune the same day. I have more mods than last time i got the reflash and i got 17whp from the last time. More mods so more corrections will be needed so im hoping for like 20WHP from that. We'll soon see...

 

i see 10+ whp gains throughout the power curve. that car should feel very different. great gains imho.

 

That's impressive... I think I see myself buying myself these headers in the future... installing them with berks HFCs and removing the stock headers & cats at the same time.

It will save me trouble and money.

 

Looks like the HR responds better to headers. Good news.

 

Hmmm.....tough decision now!!!!!
Anyway, Arsh thanks for the time and effort you have put into this project. I know it hasn't been easy!!!!!

 

Looks good, Arsh! Thanks for posting up this info!

 

No problem. I was more than happy to do it. And i have the 304 Stainless Headers

 

Are the headers legal for cali? Thanks

 

no , nothing is legal in CR of California

 

No, but if you put them on... nobody will ever know... unless you fail smog, I think with a stock cat on you'll probably still pass.

 

Or you can just pay the guy 200 bucks to pass you and keep your test pipes on

 

You are so close to 300 man I can just feel it lol.

 

Before we start spreading the word, I suggest we evaluate more before/after dyno sheets rather than making our decision solely on a single dyno. I am in no way undermining the OP's before/after numbers, I just believe we should be cautious as we approach our conclusions.

 

that's not bad... you may have to give me that guy's info later on.

 

$200 every year?! I was thinking somewhere along the lines of $20-30.

I am even more satisfied with my Berks now.