4-2-1 & dummy cat

[Hlkh]

hi ... feel like installing 4-2-1 extractor n a dummy cat n keep my original muffler stock to improve on the low end torque for beta accel.

any one try tis b4 ??

will affect fc anot ???

[Autocraze]

will affect fc anot ???

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definitely... it's a matter of how much more....

[Ddt121]

r u driving a manual or auto?

 

changing ur above mentioned will definitely affect FC.

[Nitrous]

i tot low to mid range is determined by ur extractor? anything aft tt...its for high end.....straight thru all the way.

[Hlkh]

but 1 mech. say will save petrol leh..

[Hlkh]

i drivin manual

 

but change liao improve pick-up rite?

[Hlkh]

this is wat i think oso... but the mech. say if nv change dummy cat. not diff coz cat. have the most resistant

[Dennisk]

i am riding 323, changed my to 4-1 extractor...FC improved about 12%

[Xavier]

[reply]

i am riding 323, changed my to 4-1 extractor...FC improved about 12%

You only change your extractor or including de-cat? Muffler stock?

[Hlkh]

u change to 4-1 extractor ??? b4 u change is 4-2-1 extractor?

[Ddt121]

not really improve pickup. by right, 4-1 will be better for pickup.

 

but manual, you can try to mod your exhaust to free flow

[Autocraze]

but 1 mech. say will save petrol leh..

 

presume your meaning of a 'dummy cat' means removing the restrictive stk cat rite?? which means now will be more free flowing rite?? throttle response lighter and more revvy... which I think will lead to more petrol consumption....

[Kevs]

Yup. As one bro pointed out, FC will only be affected if you change your driving style, which may be a resultant of the improved throttle response.

Go ahead and operate your muffler too.

[Dennisk]

i only change extractor to 4-1, before that was stock....cat have do anything yet...will be doing in 3 months time...muffler also stock....should i operate muffler also?

[Carmodz]

but 1 mech. say will save petrol leh..

 

probably becus when more air goes out, more air can go in, better combustion=power up=better pick up=attain desired speed faster, then can maintain normal driving below 2k rpm?

 

Jus my 2cts..

[Dennisk]

erm....gear change was at 2500-2800, now trying out with this refill with gear change at 3000-4000....trying out to see whether is it really petrol saving anot....been trying to rev hard these few days...

[Dennisk]

what is your ride?

[Hlkh]

i tot of mod exhaust but noisy