Replacing the cat will possibly reduce restriction to the exhaust gas flow, and eventually will increase power a bit. But some cars will have O2 sensor near/at the cat, I'm not sure about Persona/Gen2 though... maybe not.

O2 sensor as in Lambda sensor? Yeah it does since catalytic convertor installed. But the prob is if cat removed, possibly the Siemens ECU may get wrong readings and run the fuel mixture rich because it presumes cat asn't warmed up yet

for campro engines (Gen2, neo, waja campro, persona), the O2 sensor is just before the cat (about 1-2 inches).

so is it ok to remoce the cat?

My car located. awaiting arrive to SA. now going to sign agreement.

i leave mine stock as it is. until R3 releases their cat-free performance exhaust system for the neo. as for persona, i think it's ok to remove it, since there are R3 performance headers for Gen2 which is compatible with the persona. as for the rest (mid box and muffler) that i'm not too sure if it's the same plug and play with gen2 or not.

I have signed all the document already. More properly will get the car by this week / next monday. haha... Black colour HL...

just book ??? what doc??

still waiting

Errr, if going to mod it?? Have to reset the ECU? The AFR will gila rite...takut end up consump more fuel..

This post has been edited by ralf: Sep 12 2007, 02:15 PM

Down payment & i sold my 2nd hand car document. I book during soft launch.

i really respect the few of u owners... haven't even getting the cars oledi talikng about modding...

yosh..dats what i will do if i get a car..huhu

hi...i got my M-Line already. took delivery this morning (Blueberry Tea).... so far so good.

Now waiting for my H Line Black...

pics..pics, pics..!

You booked 2units ?

wow.... so so KAYA....

buy 2 car at one time...hehehe

unfortunately, no. In fact many documented tests dyno wise have indicated that act removal may result in higher FC and lower total power as without the cat during warming up in time (FYI, catalytic convertors need to be heated up to a certain temperature in order to work properly), the O2 sensor will still measure exhaust air mixtures to be still warming up and thus stay in warm up mode (Lower Air/Fuel ratios, retarded timing...who knows?). So unless you can remap or fine tune the air/fuel ratio to adjust for non cat setup, I suggest leaving it on unless it's busted

And as for the old adage that catalytic convertors sap power, it's no more relevant since cat technology has been designed to be less flow restrictive and many FI systems are built around the cat system in consideration

This post has been edited by almostthere: Sep 12 2007, 04:03 PM

saw one black H-Line persona on the way to subang hi-tech just now

owner tukar rim to the exact same rims that the persona envy use

the car tint until super black some more

guys, got any guide on choosing good tinted window?

choose HL. oledi tinted

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Added on September 12, 2007, 5:43 pmsame. sign all document. waiting car to arrive SA.

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Added on September 12, 2007, 5:47 pmthx 4 ur advice. maybe i should wait for Persona Envy spec. they should tuned up something on the Envy model. I think Persona engine hv some diff fron gen2 engine. so r3 spec maybe cannot suit persona.

This post has been edited by wkho555: Sep 12 2007, 05:47 PM

You're not really on the money for that. Basically besides remapped shifting strategy for the automatic transmission, the S4PH still remains the same AFAIK with maybe a few more fine tuning for the fly-by-wire throttle. As for the variable geometry intake and Camshaft profiling, which I hear will be first launched together on a facelifted version of the Waja, that will be a different ball game altogether (In case you're wondering, I managed to prod a salesman who was shocked about me knowing about CPS so shared with me what he had already seen). So the question to remove cat or not to?

Unless proven with a dyno test that power and torque curve improved by throwing out the cataltytic, I'd say don't.

This post has been edited by almostthere: Sep 12 2007, 05:59 PM

wow..2 cars...pictures please...havent seen a blueberry on road yet...saw a red one just now...the red is soooo bright...

also saw a truckload of personas...but no solid white color...damn...