btw, i just remembered. the 4-2-1 headers for persona i saw yesterday, the O2 sensor is to be plugged into the 3rd pipe outlet. I heard that its best to relocate to the bottom of the header where it joins to the single pipe???

Is there any much difference?

under edit.

This post has been edited by jasondotcom: Jan 15 2011, 10:28 AM

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Added on January 15, 2011, 10:33 amPoisoned kaw kaw.

Went to STY exhaust, 3rd mile Kuching to survey the headers GOT POISONED BIG TIME and ended up getting one. I have two choices. One, was to get the older design which is 4-2-1 also but the way the primaries meet up with the secondaries are in different config than the newer version whereby cylinder 1 and 4 shares the same secondaries and 2 and 3 cylinder shares the same secondaries and the O2 sensor is at the 3rd cylinder reading. The new version is the o2 sensor is located at the bottom end of the secondaries. Config of the new version is cylinder 3 & 4 goes into the secondary, 1 & 2 cylinder goes in the secondary. So meaning, the newer version have better flow out of the engine cylinders.......following me so far?

So anyways.... summary is.... i got these:
1. 4-2-1 header - RM300
2. Top Cat mid box replacing the original unit. To reduce metallic noise after installing header. - RM180

Results:
Lighter engine feel. More willing to accelerate. A bit of "zingy" noise at the header which is normal. Engine sounds less stressing when accelerating (its quieter actually, less of the engine roar noise.


Pics!!!!!!

The 4-2-1 header. Design is copied from Super Street headers. The other is the midbox from Top Cat.






Before


Pic showing the valves inside the exhaust port


Dismantled


I killed the CAT (catalytic converter)


This post has been edited by jasondotcom: Jan 15 2011, 10:34 AM

Installed









Relocated o2 sensor

Oh.....and i checked the stock diameter for Persona exhaust pipe.
Stock is about 1.8 inches plus. Almost 2 inch. The aftermarket headers are about the same....

Midbox is about 2 inch diameter.

All measured base on the inner diameter. NOT outer diameter. But the rear muffler outlet pipe is smaller... Didnt measure that though.

And if you noticed, the aftermarket header in mine does sit lower under the car... i would say its lower about almost an inch.

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Added on January 15, 2011, 10:46 amxandras: Chicken brand from "Uni" KL side. It is noisier indeed. Design is copied from Super Street. The 4-2 config is like Skunk headers.

Can hear "zing" noise that comes from the header which is normal for most aftermarket headers. The muffler (stock) at the back is slightly louder but not noticeable at all while inside driving.

If you are observant enough, the 4-2 join config is different from brands like Hotbits and Powerzone.


This post has been edited by jasondotcom: Jan 15 2011, 10:46 AM

One year four months.
Automatic.
Are you feeling poisoned already???!!

Later i will post pics showing the internals of the CAT, burned marks of it showing roughly how hot it gets and how restrictive is the stock cast iron exhaust manifold..... It gives you a picture (imagination / visualize) of how restrictive the stock header is with its CAT bolted right under the manifold.

To be updated.

High speed? Not yet.

I got poisoned thats why i changed it that day. Actually i have it in plan for long time already but then always delayed the project till i saw the one with the properly placed o2 sensor location. Because a some aftermarket headers, the o2 sensor is placed at either cylinder 2 or 3 for reading. It is not accurate that way since it reads not from all cylinders.

No joining. They just dismantle a part of the wire casing (plastic flexi tube) and pulled it to the back. Very easy and effortless.

talking about configuration, what is my config?





This post has been edited by jasondotcom: Jan 16 2011, 07:39 PM

oh.... just wanna have inputs mah thats why i asked. hahah

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Added on January 16, 2011, 7:50 pmzeng how u know the campro iafm firing sequence?

This post has been edited by jasondotcom: Jan 16 2011, 07:50 PM

Oic...thought so now why didnt i think of that!

Brand? It's chicken! Made by "Uni " from W.Msia.

a dirty air filter does bring down ur engine performance. that day when i replaced my filter with new stock filter i can feel the difference already....

oh btw... next project... black roof (solid black) on my silver ride.

u didnt even state the price for it... how to comment???

btw... 08 persona does not come with IAFM intake yet. Does it? Cuz my lil bro's 08 used Persona does not. A lot of difference in terms of FC and power man.... seriously.

hummm...these couple of days... on two occasions when the engine is completely cooled off especially end of the day after work or early morning.

when start driving (while on the move) the engine looses power for a few seconds and gets back up again.... no jerking whatsoever. Just lost power (but not to the extend of stalling). Weird. My bro's 08 Persona also having such problem.

anyone knows whts wrong?

This post has been edited by jasondotcom: Jan 19 2011, 08:57 AM

Actually you are over speeding also. Drive according to speed limits man and drive safely.... CNY comin soon

This post has been edited by jasondotcom: Jan 19 2011, 09:03 AM

nah it wont. even my aftermarket brake pads didnt. this depends on the SC you go to. some very pukimak wan...

btw.... what rims u have??? show off please!!!!!

iyah missed it..... remember which post? i go see...

btw, how much are bendix MKT for persona in the market now???

i got a new pair of Trestor Advantage that i bought a month ago for my almost due (very thin) brake pads (currently on Trestor advantage also). I wanna sell this off to get bendix pads instead.

zeng, ahpaul: thanks for ur replies. gonna survey the price on my side then...

hong: time to change! those bosch pads sucks big time. btw, i never trust bosch brake pads. crappiest pads in the world. i almost had a big huge car crash during the days when i was driving my honda civic. sped down a straight at 160kmh reaching the roundabout, hit the brakes..... brake fade almost immediately, drop the gears (manual) still not enough.... stepped the brakes sooo hard with all my strength...still cant stop, traffic round the roundabout was moderate,... i just barely "slipped" in between the moving cars in the roundabout and fish tailed some more..... and i swore over my dead body that i will spit on and never use bosch pads ever again.

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Added on January 19, 2011, 10:04 pmyea i believe on dyno. there are no existence of such a smooth road in malaysia whereby there is virtually no vibration noted in this vide at "high speeds".

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Added on January 19, 2011, 10:06 pmtry replacing ur exhaust extractors / headers to 4-1 or 4-2-1 and you will feel far more smoothness and far better acceleration man..... try it.

i am pretty happy with mine. damn satisfied.

This post has been edited by jasondotcom: Jan 19 2011, 10:06 PM