if your car is auto then i will ask you go to change cam pulley...and should be need do some setting in ECU...(sifu sifu pls correct me if i'm wrong).

if manual...both also can change but there will no more power is back end (high rev)......but if you need a bit pickup and still need some power in back end then go for 4-2-1...

remmember only change 4-2-1 exhaust pipe not all pipe from front to back..pls maintian back end pipe...one sifu tell me like that....

yar..i also using WIRA...when the car is new sure got many sound but now is 4 years already some of the sound is gone..but proton already found out many problem in wira and solve some of it...but Persona still new...just 2-3 year is market (pls correct me if i'm wrong) sure there have many problem they not yet found and fix it...more over now persona order is high..for sure the quality is bad...      

why i say sometime some problem we dun want SC to fix it due to SC is cannot fix your problem and create more problem to you except you ask them to change a new part...change a new part should be solve some problem...if ask them to fix.... then i can say no need lah......  

they cannot repair my WIRA power windor since 1st day until now moreover make my power windor broken (cuted one bar support) in the  power windor... when i send the car to workshop they say cann't help me already due to they cuted the support....that is my sad Experience in SC...at the end i stop my last 1 year Warranty and no more send my to proton SC....

so now only can base on this forum and found out all th problem from the persona or gen 2 sifu-sifu to help us solve the problem...

Yeah, I was planning to change to 4-2-1 exhaust pipe only, but my friend change the entire exhaust until the end with a loud sound exhaust which I dun like, too noisy.

Yeah, mine is Auto, but by changing the cam pulley will it affect my engine or any side affect?

ok, how to do the setting in ECU? Any guidance?

According to some forumers, the noise is diesel engine-like. I'm not sure whether mine is malfunctioned but it's a bit noiser after about 2 months of owning but power wise remains the same. 
Some people are complaining that their cars slow like a turtle when IAFM really 'kaput'. 
Is your engine emitting 'tak tak tak ....' noise?

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Added on August 18, 2009, 12:57 am
Mine got 'kok kok' sound (Not the famous metal knocking sound) at the front, driver side as well whenever I go through a bump. Then one day I floored the pedal when going through a bump, strange.. the sound gone. 
How's your Persona so far? Mine is still fine except some minor rattling problems from the air cond vent and the engine sounds a bit rough..

yeah,i got the "kok" sound whenever go through a bump also, then sent to SC to check, they tighten the Lower Arm Bolt then the sound is gone. But this is different from what the "kok" sound after the left turn like what i mentioned....

hi Penang friends,

may i know which tint brand is good & quality and having a promotion?
can give me some advice?
i'm planning install tint for my perosna ...burget only RM600...
Air-Cool  is ok or not?

thansk .....

You can go to "BREYTON" located at Krystal Point

If you have the buget, go for high end V-Kool, the difference is obvious compare to my rm7xx AirCool for other car..

i'm no idea in Persona auto car....if wira i know...no use to change 4-2-1 exhaust pipe for wira auto because you cannot feel it..and it a waste

if you change pipe become 2" or 2"++ plus 4-2-1 exhaust pipe it only give you fast pick up but may be when go high rev the car is no more power...so compare a car only change 4-2-1 exhaust pipe this car can faster then you when in high rev.....

cam pulleys enable adjustment of timing for improve engine performance and response as required and cam pulley advance retard valve timing camshaft engine rpm vvti low mid range peak power drag racing ignition lift duration misconception.

so if you change pulleys then you need maintian 4-1 then you car can have power at back end.

all is depand the people how the mod their car and what performance you need.
hi all sifu...pls correct me if I’m wrong..

sometimes they lower arm were not tghten properly. Got few of my cust face this prob...but too bad mine was not this case

hi Penang friends,

may i know which tint brand is good & quality and having a promotion?
can give me some advice?
i'm planning install tint for my perosna ...burget only RM600...
Air-Cool  is ok or not?

thansk .....

Oh, so which mean if I change cam pulley, I no need to change the exhaust pipe to 4-2-1. Erm... will check on that. Thanks for the advice.

Alex, did you add any strut bar for your Persona?

hi  Amras of Nargothrond

i not interesting in car body  
Not so no experience on this. Very sorry.
I only interesting in performance and audio.      

waw bro.. same la.. but I'm interested in audio only..
planning install audio system after 1 year..
now still got warranty.. so dont wan install 1st

still     
haha... still thinking how to install a USB play in the persona car...sure need to wait after 1 year...
many part need to remove if change player..... proton car ma.....

just now i call the shop...they say have promot...normal tint 80% front and 88% Window is RM688.
Air Cool Safety Film Promotion RM688* this one is 50% front and 88% Window if want go for tint 80% front and 88% Window then will need to pay RM988..

I help my friend choose for his vios.. keng ..
got usb player, can support ipod all those..
total around 6k

wah lau eh...
6k woh...can buy a 47" LDC liao....
Proud to him   

his house also got that LCD.. not 48" ar?
btw, does persona side mirror can change?
it look very small for me.. lol....