okay, but what if I want more on performance?

any recommendation?

which type of performance? low end or top end?

I'm more to low end.

But my extractor would cost too much if it is custom made for 4-1.

Current plan is extractor 4-2-1, muffler (straight flow) and midbox.

Pls do recommend.

mind to share where is the extractor shop you mentioned? they can do mandrel bend?

by the way, like what bro wandzul replied. change your extractor, midbox(to replace catcon) and even muffler first. dont touch the piping unless you know what you want.

was using 2" piping and i need to waste money to change back to stock size. it's your call anyway.

I see.

for extractor for now i plan to go to Super Street 4-2-1.

I asked if they sell 4-1 extractors but they said it'll cost a lot as they have to custom make it for me.

As for piping size, I was told to change to 1.7 or 1.8 inch.

Muffler straight flow.

But I was told by my friend that stock piping is okay, and he asked me to just change my extractor to 4-2-1, muffler straight flow and add a midbox.

He stated that in terms of performance will be better than changing my piping as I did not make any major mod on my engine.

That statement of his is something new to me as I am a newbie in this.

That's why i needed a third party advice.

You might not believe me but, if you really want low end then can consider this setup

4-2-1 (since u already have one) > 1.6" piping > spiral bullet > s-flow (may add a midbox after bullet if u want more silent exhaust note)

1.6" piping is as per r3 piping size.. used this myself and low end was good..
now i've changed to 2.0" piping rojak with 1.8" piping in favour of mid-top end (since i've had few ponies added), resulting of losing a bit of torque.. feels like wanna use back 1.6" piping but have no budget allocated for this yet..

This post has been edited by wandzul: Jun 24 2012, 01:56 AM

I see.

Sorry that this question may have already been asked and answered but what does a spiral bullet do?

If I only change my extractor, piping to 1.6 and s-flow, will it be okay as my budget can't include midbox.

I can only pick between midbox and piping.

help provide backpressure.. which also translates to better low end..
up to you, if u want to buy midbox, get one that has smaller piping in it (a bit more backpressure)
if you're not sure then go for piping job

my 2 cents

This post has been edited by wandzul: Jun 24 2012, 11:18 AM

Okay. Means midbox over piping? Just to confirm.

What size of piping would be good for low to mid? (Just curious).

And from what I see, s-flow mufflers are like really big as compared to straight flow.

Hi all sifus out there, I currently got wira 1.6 auto efi, how can I mod the exhaust system to gain better pickup and save fuel?? Currently is stock system wif 4-2-1 output. My location is Johor bahru, any reputable workshop I can visit??

Bro, i'm currently driving honda city 2009. I been using the K&N drop-in air filter for my. I'm planning to change the intake system to Open pod type. What i'm afraid now is is open pod filter suitbale for auto tranny car like mine? Afraid that instead of improvement, it lose powerusing it.

Note that there is no other modification of exhaust system done on this car so far.

Please advice. TQ

This post has been edited by devilkevin: Jul 17 2012, 01:36 PM

open pod will make ur engine noisier then before, why wanna change to open pod? i think K&N filter replacement is better enough.. summore auto tranny, scared u will lose a bit torque bro..

to use open pod u must combine with suitable extractor, piping, n muffler system.. if not there's no use in using open pod.. intake n exhaust need to synchronised, then u have better setup compare standard..

---

Added on July 26, 2012, 2:52 amtry add another mid-bullet to increase back-pressure inside ur piping.. for NA engine, back-pressure is important especially NA with auto tranny.. wanna save fuel just control ur right foot bro..

This post has been edited by amad108: Jul 26 2012, 02:52 AM

Hello guyz, am currently driving saga fl 1.3.

Was planning to change full exhaust system.

My aim was to get more power n improve fc.

Is it advisable? Thank you.

Just got this in the mail.



Full Race Motorsport TIG robot welded goodness in Twin Scroll config. Tomorrow it leaves for ceramic plasma coating, honing and if I get enough money, a Magnaflux check. To be mated to a Garrett GTX3076R.

Is it possible that I just change the extractor and add in bullet only? I dun wanne change my muffler coz I dun wan it to be noisy and attract the authorities.

can why not.. last time i did change piping to 2' size with standard muffler n 1 spiral bullet at mid.. extractor stock coz wanna keep the normal response for daily use.. usually change extractor can increase exhaust flow which benefit for mid to high rpm, but sacrifice a bit at low end torque..

I am very interested in this "spiral bullet" that people keep talking about here.

Can someone post a picture here?

What is it for? What is it supposed to do?

from what i heard and very basic/shallow understanding, it is supposed to increased the flow velocity by artificially having it to swirl and having minor bump like "resistance". think of water fall, how rocks and such caused water to flow more rapidly.

now. whether that actually helps on performance, i dont have a single clue about it.
google:
http://www.zerotohundred.com/newforums/car...-corner-19.html
scroll down for pic

http://ritzzuan.blogspot.com/2010/09/my-el...m-upgrades.html
also scroll for pic

=edit=
after some reading, apparently it is to create back pressure? wouldn't a s-flow do a better job? or they want a straight flow but still want a bit of back pressure? ...?

This post has been edited by Quazacolt: Aug 7 2012, 07:49 PM

Thanks for the pics!

Flow and CFD happen to be one of things I do for a living, that's why I'm quite interested in how it works, although my skill level is borderline retarded.

Given the Reynolds number of typical exhaust gas (composition tikamed with AGA-8) and the bend factor, I'm not sure how it would increase velocity via the swirl. I guess the velocity would increase from the restriction but the swirl would create more turbulence, sapping it of kinetic energy. But I guess I'm not qualified enough to give a final answer, given the shape of the thing.

Just dreaming of a good exhaust after my friends at CEEFC threw around the idea of a few of us quitting our jobs and building high performance Inconel manifolds and titanium exhausts.

The best way to create backpressure for a system without turbulence or disturbing the pulse or lamellar flow is with a venturi type of restriction. Preferably cast or machined rather than rough welded.

This post has been edited by empire23: Aug 7 2012, 08:10 PM

you're way too humble if you consider your skill (that you do for a living) borderline retarded. hell, a lot of the terms you mentioned in your reply i sure as hell don't get less i google them up myself lol!

eitherway yes, machined casting/welding is definitely going to be more precise, and even easier on "troubleshooting/tinkering" (trial and error?) than rough welding. as your results will at least be linear and not have another random variable of human error to worry about.

eitherway, good luck on your venture should you proceed with it. i'll just watch from the sidelines!
(definitely cant afford titanium exhaust, so... yeah lol)