Hmmm, interesting, I will have to keep my eye on this. I am always interested in cheap horsepower, although I don't know my local laws on emission tests. I know it is illegal to not have cats, but I didn't have them on my truck and didn't get caught. Will have to check this out. Sounds like this, along with borla headers and exhaust might be the ticket for the money. With this, borla might not even be needed as much, who knows.

 

WHO SELLS THEM GODDAMNIT!!!

 

I do

 

I talked to two vendors who have been playing with headers cats etc and with this mod shorty headers are not needed. That's 600 bucks you can do something else with, my extra 6 bills is gonna redo my exhaust to true dual cancelled the shorties.

On my LS1 I had top of the line stainless shorties and didn't gain any at the Dyno or the track.

Wed a guy did headers and raced and lost time. He was pretty bummed. You just never know!

 

Huh, that is interesting, so when you say shorty headers are not needed, are you talking about the headers put out by Borla?? What about the Crawford Headers??

Also, I assume that you are saying that the Borla exhausts are still needed/wanted with this mod. Correct???

 

I'm gonna post sound clip soon! but before I'm gonna put the Borla resonetors back in the system... rigth now is TOO loud for me.

P.S. No CEL and still going!!!

 

so you're saying with this pipe, headers are not needed?

 

you do need headers, these pipes replace the cats.

 

I know this....a couple posts up someone said that with this, headers won't make any performance gains.

 

If you know that, then why post asking the question? I thought what you asked was pretty straightforward.

 

Hmm, I would say that headers should still be able to make a gain as they are before the system that is affected so to speak. Now I imagine that moving a very restrictive portion will allow the gases to flow a lot better through the stock manifolds (less restrictive backpressure). But since the way the gases are flowing out of the stock manifolds seems to be not as efficient as the equal length headers; you would loose that extra hp & tq you could gain from utilizing them. I would think a new pair of headers regardless of what type should have an effect, either detremental or beneficial. I would imagine the nismo headers or borla's which are making more power w/ cats, should just add for more gains because your adding effeciency to the engine at it's first component: the headers, which would of course be better benefited from no cats . All right, that's enough theoretical crap, my brain hurts! lol. If my reasoning is witchcraft, then by all means, enlighten me

L8te!
--Justin

 

Pardon my ignorance....

I'm getting a set from lsdunique but haven't raised this issue/question with him yet.


Today I was looking at the Borla headers and they seem to have bung holes in them already. They're hard to see in the pics, but look back end. At least thats what I think they are. The NISMO headers have them as well. Wouldn't the O2 sensors plug in there?

If this is so, couldn't we just run straight pipes or hi-flow cats from the headers and not worry about the sensors going off?

P.S. I "stole" these pics from other posts. Sorry I didn't ask first, they're not modded in any way.

 

NISMO headers

 

true, there are bungs for O2 sensors in the headers. The system uses 2 sensors per side, one before the CAT and one after the CAT.

Don't worry, yours will have both.

 

Thanks! I thought I would have to wait till Monday. Don't you ever not work!

For those who have probs getting ahold of lsdunique, I've had none at all. He's answered all my questions and is more than willing to explain thing to me.

 

The issue about if the headers make or not hp depends on whether the headers better the flow of the stock manifolds. If the stock manifolds are well designed and equal the flow of most of the headers in the market we won’t see any gains. However, there is an important thing going on here, the headers are BEFORE the cats, and because of that if the cats are too restrictive the headers won’t do much effect in improving the exhaust of the engine. Until someone does this, headers + cat pipes + Borla (or any other exhaust) we wont know for sure if there will be any improvement in performance. But if we keep listening to people that just keep talking BS about what does and doesn’t gives hp in our engines without trying first, we will never make any improvements.
MaxHax has a point, until now, there is no object in installing headers if you can put on the cat pipes and gain more hp than with the headers alone… also they are cheaper!!
but that doesn’t mean that with the two mods (headers + cat pipes)you will not see noticeable gains in performance, until someone does this we will never know for sure.
Some people in this forum told my brother once that removing the cats would hurt the engine and its performance because of the lack of back pressure…they where wrong…

 

Headers... making power?

Oh yes... yes we did. BIG power.

www.crawfordzcar.com (Look under R&D)

We made more power than ANY of these other names, and ours is all bolt-on PRE-CAT!

 

They make so much power that the engine knocks! Yowza!

 

Well I guess I'll be the first. Its just a question of NISMO headers + cat pipes or custom long headers tied into the cat-pipes. I'm leaning towards the latter. lsdunique should have mine done in about ten days, then tested and dynoed.

The cat-pipes that webcarconnection has installed are very promising. My concern at this time is the custom headers vs. the known performance of NISMO headers.

Anyone else willing to try one of these set-ups (all in one vs. headers/cat-pipes)? You can pick one way and I'll go the other, then we'll have both tested.

 

I know how it works. If you pull the sensor out of the exhaust stream it will not produce a voltage to compare it to. Then the ECU will think the sensors has malfunctioned and throw some codes. If its in the exhaust stream it will produce a voltage. There for it will think the sensor is still functioning properly and the car is just running richer or leaner than normal.