Found it....Headers for V6 RAV4...positive answer

[Zeoth]

Originally Posted by STY

If anyone has experience with new headers, is it a noticeable power increase?

Does it require the exhaust to be modified to realize any improvements?

If it makes me a little bit stronger off the line, I am definitely signed up.

Yes there is noticeable power increase but not that 25% that someone mentioned. Basically like everything else, honed headers properly proportioned will increase efficiency of the engine. That equates to power increase with MPG increase (under normal condition not foot to the floor kind of driving).

As for noise, there really isn't much of a noise increase with a stock exhaust. You will get a slight different tone because the exhaust is now flowing slight bit differently but it's nothing like an exhaust system. To get the full power gain (from just basic bolt-ons) you must change the intake to headers, to a full cat back exhaust. Size matters but larger is not better. Just remember that hot air flows faster and if you remember your physics, PV=nRT.

[Zeoth]

Originally Posted by mensajero

And last but not least, in the majority of the times, it's the first mod every car enthusiastic does to his/her ride.

Actually... I think it's one of the last. If you aren't counting ricer mods or suspension mods, the first mod is usually the intake.... followed by the exhaust.

[VAN]

Well no one knows yet to any questions cause the guy has not got back with me yet.
So still waiting to see if we get any answer.

[mensajero]

Originally Posted by Zeoth

Hey, V6 doesn't use 4-2-1 or 4-1 headers. They are usually 6-2-1.

OK, just change the 4 for a 6 and your all set.

[mensajero]

Originally Posted by Zeoth

Yes there is noticeable power increase but not that 25% that someone mentioned. Basically like everything else, honed headers properly proportioned will increase efficiency of the engine. That equates to power increase with MPG increase (under normal condition not foot to the floor kind of driving).

As for noise, there really isn't much of a noise increase with a stock exhaust. You will get a slight different tone because the exhaust is now flowing slight bit differently but it's nothing like an exhaust system. To get the full power gain (from just basic bolt-ons) you must change the intake to headers, to a full cat back exhaust. Size matters but larger is not better. Just remember that hot air flows faster and if you remember your physics, PV=nRT.

The person who mention 25% was me. OK, it might be pushing it a little, sot of. But how long would you think after you guys get those headers in will you last without adding a K&N intake, dual pipes all the way to the rear. tinkering at the OBC.

Yep, I said the same thing years ago. I told my wife: "This is the last mod, after this I'll put away the tool box and that is the end if it"

Yeah, tell me about it. We are all humans and we all want it better, and faster and cooler, and better performance, better handling, and better tires, better wheels. The bug will eventually sting you. It's a question of what's available. We (or you) will go for it. Which is cool. 8). Like they say in my country "Te habla la voz de la experiencia" which mean: "We spoke to the voice of experience"

BTW, who doesn't want to be cool?

[mensajero]

Originally Posted by VAN

Well no one knows yet to any questions cause the guy has not got back with me yet.
So still waiting to see if we get any answer.

You know VAN what would be an excellent move. Send the dude a link to this forum/posts. As you can see, it's starting to get attention. That's important.

[Zeoth]

Originally Posted by mensajero

You know VAN what would be an excellent move. Send the dude a link to this forum/posts. As you can see, it's starting to get attention. That's important.

Good call.

[VAN]

Already did when i sent the email. I have not heard anything from him. I will send another email and see what happens.

[flyingn]

headers in no way shape of form will ever deliver 25% hp increase on modern engines.. in fact headers on otherwise stock engines won't do much of anything. The engine already has a header like exhaust manifild on it to begin with anyway. Guys.. your throwing away your $$ (its a heafty note for custom headers) for maybe a few hp..

just to let you guys know...

[RAV4Don]

Originally Posted by flyingn

headers in no way shape of form will ever deliver 25% hp increase on modern engines.. in fact headers on otherwise stock engines won't do much of anything. The engine already has a header like exhaust manifild on it to begin with anyway. Guys.. your throwing away your $$ (its a heafty note for custom headers) for maybe a few hp..

just to let you guys know...

Yep, what he said.

These engine's headers and most that are designed today are not nearly as restrictive as the older cast iron "logs" of years ago. Sure there will be a small gain on a stock engine with a well designed and tested header, but not anything near 25%.