3-2-1, 1.5" piping, bullet and straight flow muffler, mine is a manual


got it


ok getting more power at higher rpm is consistent with ur current straight flow, that is the trade off of exhaust mod, u gain in one end, and u lose on the other, for ur case, power only felt boosted at 3.2k instead of 2.8k but ur higher end power is more.

do u like the power u have now in higher rpm? or u like the setup but wish the starting boost stays about the same rpm as before? or anything else that u want to improve?

u will feel higher boost with bigger pipe diameter midbox but since noise is an issue, if got space why not install another midbox right after the first one? the bigger the pipe diameter the better but if scared too noisy then keep to same diameter on what u have now but the potential would be limited. it muffles better than bullet and if the 2 midboxes are close enough to each other it would form a bigger termination box than what u have now and thats good for power overall, but some exhaust shop would refuse to do this, i think it would work.

Compare to current setup (4-2-1 header, aftermarket midbox and new muffler), I prefer old setup (4-2-1 header, aftermarket midbox and default muffler), cause 90% i drive at city area. Seldom I rev 5k rpm and above

For bold part, how to do it?

This coming Thursday when go to exhaust shop, will ask them measure downpipe length and try this method



2 midboxes setup, which one give better performance
4-2-1->defaut pipe->midbox->midbox->default pipe->muffler
or
4-2-1->defaut pipe->midbox->default pipe->midbox->default pipe->muffler
or
4-2-1->defaut pipe->midbox->bullet->default pipe->muffler
or
4-2-1->defaut pipe->midbox->default pipe->bullet->default pipe->muffler

Noob question, why exhaust shop refuse to do this?

Hey guys, I had an exhaust setup error problem here...
recently, my car no power...since after i changed my car's exhaust system...(i lost my original stuff after left it at friend's house, he lost it too)

My ride is KIA Forte 1.6L Automatic. Originally 1.6'' piping, and i change it to 2'', while feeling underpowered, i changed it back 1.6''. but problem is, my original center box which came with catalyst converter, is lost, and i can't find it again(unless buy it for cost of RM3k)....i used a mid-box recommend by exhaust shop, ended up feel no increment of power(low to mid-end torque).

Original system 0-100km/h at max 12 secs, now is around 13.5-14 secs......I did like 2 know is there any mid-box that can help providing low to mid-end torque??? So far, i only found out there are 2 types only....twisting mid-box(i m using it now), and straight flow mid-box(minimum of 1.8'' diameter).....do u all know anything type or any other types of mid-box should i use to get bck my low2mid-end torque or better?

mid box also got swirl type? i thought bullet onli got...lol...

anyway, u do not need swirl type as u alrady change back to 1.6" pipe... imho, d bullet/box shud b put near d ori place to gain bc ur power losses... u can find mfa in auto garage sales.. i think he can help u solve d placement

thx...

Noob question: how to measure collector length? from where to where? mine is 4-2-1

from end of extractor to the first bullet or change of pipe area

Not until the flexible bellow??

You mean from end of extractor (bolted to engine head there) until change of pipe (after flexi pipe there)?
Thanks for the info.

Would like to improve lower end a bit more than current setup (which got bullet right after pipe change area), so I would just try to move the bullet further back a bit & experiment, right?

collector length usually refer to downpipe, point from header merge collector outlet where 4 pipes merge into one until the first bullet.

the flexi is also a change of area but not a significant one

yes, try allow a length of collector pipe minimum of 18" before putting bullet in, the downpipe will improve torque across all rpm, not just the low end. this is a general number though

My low end torque is baaaaaaaccccckk!!!
I've changed back to previous nenas/flexi pipe.

To 4G13 owner,if ur car is stock,don't use 2 inches nenas or piping.suffer wei last few weeks with the 2 inches nenas..
wei low yat 82,come shah alam.i kasi test..

hi guys.. i'm new here anyway
i'm just setup me exhaust system at EXSS WORK last week
myvi 1.3 sxi (manual)
costly rm2300.. really crazy
but i'm totally satisfied with the perfomance

mr sharom advise me to do his way
and it is proven!
it is true pick up & torque is super superb!!!

the problem is the sound is like normal standard myvi as usual
i like the one which sound quite loud.[COLOR=orange]
even though my myvi perfomance now is tip top
but i still want that sound in my exhaust


[color=green]so i'm here to offer u guys who want my exhaust system
i have the receipt 22/10/2011
mr Shahrom useing 1.6" pipe - 2 oval mid box(inlet/outlet 1.6") - 1.6" pipe -
Hotbits chambered muffler located beside the fuel tank - 1.6" pipe to the back


but i only want to sell the Hotbits chambered muffler located beside the fuel tank - 1.6" pipe to the back
price rm600.. negotiable[COLOR=red]

you will not get this price with mr shahrom hehe..
can test my car first if u guys want.
014-7117172[COLOR=blue]

This post has been edited by syafiqariff: Oct 25 2011, 03:08 AM

hehe! thanks for d experiment yo... but i dunno my flexi pipe size though... y shah alam a? u not stay at kelana jaya ka?

m havin dilemma wit my torque curve la.. how come shape like sheet 1 a... bcoz afr or wat a?zzzz


from my analysis, it seems m havin problem wit 4k rpm..

n from d calculation i did for my engine,in terms of wave / pressure analysis,

d stock intake ruuner length is maximise for around 4k rpm wit 3rd Harmonic, means cant sqeeze anymore

d exhaust currently tune for 3k rpm, guess i can tune this part for better mid range torque... mayb tune for 4k rpm..

d piping currently at stock 1.5"... tuned for 3k rpm.. guess i increase d size to 1.6-1.65" to tune better power at 4k rpm range...

not sure shud i tune for max torque instead as its quite far away at 5k rpm....let me noe wat u guys think of...


lol..nice stuff... exss work i saw their facebook b4. they use wave pressure tuning..but d price r....

I'm from shah alam la dei..

To all who want to tembak me and say flexi pipe size doesn't matter,go ahead try to change to big size.
Even exhaust shop tembak me and say that flexi pipe doesn't matter.
But then after i explain my problem,then only they started to "oh ya la maybe got difference"
F**k la..off course got difference..if u compare the inner size of a small and big flexi pipe,big difference la..
Front portion of exhaust system pulak tu..haiz..
If anyone here want to tembak me,hold on..chill..
Go to exhaust shop,buy a flexi pipe that is bigger than ur current flexi pipe and install it.
Use it 1 month see u can tahan or not the almost no low end power..hahahaha

haha... u taiko ma.. they too bz sellin exhaust forgot ab d importance of flexi pipe.

i guess when u say really got different means can feel.. dunno mine wat size..goona see it when change piping..
shah alam where? not free la... goin to langkawi on this thursday..huhu... comin back on 29th... means cant join u guys for dinner

Dei what taiko..
Eh u confirm mau tukar piping ah? naissss...
Langkawi apa bikin? come la the 4G1series dinner..got lots of straight road there to test..hehehehehe

ya... confirm... increase to 1.6"-1.65" (internal shud b 1.5x) dun wan too big la.. later low end reduce alot..cannot la.. coz 95% i town drive.... >.<"

langkawi las time alreay buy airasia ticket... pergi balik onli rm90 for 2 person... huhu..

Before u tukar,come la test my car first.feel the low end power first..if nice for u,then change la 1.7 inch..

I using 1.7" too ... Orgasam wei

like dat good also.. i contact u after come bc from langkawi..huhu..

lol...