should be ok i think... whats ur exhaust piping diameter??...
4-1 extractor mainly useful for high rpm usage... perhaps good for high revving engine like campro cps... by using s-flow muffler, back pressure is kept in check so u dont lose so much low end torque....
2 bullet + s-flow muffler still noisy??.. if all 3 are working well (fiber still alot), ur sound level should be around the same as stock standard.... check if any unit of it has worn/burn out fiber inside...
extractor - as its name said, it extracts exhaust pulse out from ur engine... a well tuned extractor creates scavenging effect which helps siphon out the exhaust has from combustion chamber (instead of having ur engine piston to push it out)... generally for inline-4 cylinder engine, extractor (or some people might call it header) is normally categorized as 4-2-1 or 4-1 formation depending on how the piping merge together... 4-1 mainly useful for high rev application while 4-2-1 suitable for street driving where most low-mid torque is utilized... of coz, under each category, there are long and shorts of primary piping and secondary piping to be considered besides having it equal or unequal length... and how collector box merge 2 or 4 pipes into 1.... its basically fluid dynamics theory...

bullet is mainly used to suppress the sound of ur exhaust system... it also acts as a "reservior" or some sort to improve on throttle response... too big "reservior" will create turbulance inside which increases restriction in exhaust flow... while having no "reservior" will reduce throttle response as sudden increase in exhaust gas will have to "wait" or "line up" before exiting at the back....

CAT is a short form for catalytic converter... it is a very special resonator box which converts harmful CO gases emiting from ur exhaust into more environmental friendly CO2 gas.... it contants very expensive material inside, which we take for granted as it restricts exhaust flow.... removing the catcon is illegal in certain country.... but in malaysia, so far we are still not restricted to such environmental law... removing ur catcon improves exhaust flow, which will releases more hidden horsepower....

friend using 4-1 no prob..but he is using center bullet and straight flow tabung behind...

ur s-flow can sell to auto car users

keep your 4-1....ur tabung behind use straight flow...not straight flow bullet ah beng lalachai sound...but the box type...your cps is for high end....when ur lift kicks n n goes all the way to (dono exact rpm cps can reach)rpm u will feel the pull.....dont restrict yourself with 4-2-1....but the choice is up to u ultimately....

i drove his car no problem...fuel consumption better than standard car with the additional power (but he has done intake mod already airbox filter etc)