i disagree with it...piping size doesnt always relate to CC...its more on the amount of power u have and where in the rev ranger is that power at.

take for example 1.6...campros and CPS goes up to 2.0 and the gain is pretty decent... even CPS stock piping size is 2.0....go bigger and kaput...

but when it comes to the 1.6 MIVECs and VTECs...although the 2" pipes is pretty decent for those engines but they benefit more with 2.3" especially since most of the peak power is at the higher end of the rev range and the bigger pipe size really benefits the higher rev range.

my 2.0 VTEC is running 2.5" pipes.. and its good...so good.. 4-1, 2.5" pipe, 1 midbox, no muffler.

i also have an exhaust cut out valve.. so when the valve closed the exhaust is forced from a 2.5" pipe into a 2.3" pipe and s-flow muffler.....i lose 15hp about 1.2kg torque. tested this on the dyno just yesterday

so max n/a is 2.0"??? big big no.

Lolx~! Really got helped one meh? I got a friend driving 4G63T wira... He has modified a lot... Everything not standard... Horsepower 560+ with dyno test... He top speed only 260km/hr because the rpm aalready  almost max >< I really hard to believe 1600cc can reach 265km/hr~

your last time is your first time.hahahaha
same with me la.

Can I have both?&nbsp;

wow..been reading a lot for exhaust setup till i screwed myself! too much different opinion here n there        
By the way, i can see a lot of forumer in this post seems knowlegedgable, which i hope can help me finalize my decision before i bought any exhaust system.

I'm driving a manual tranny Persona Campro IAFM, and currently looking into better exhaust system fits. Currently i have a free PZ 4-2-1 extractor inside my garage, which is hoped to be used in my final decision on this setup. As, i have financial problem to grab full system from PZ, can u guys recommend me best exhaust setup for efficient performance/FC?

Few notable concerns:
1. should i change my piping size to any bigger?
2. y should i select straight bullet instead of spiral? what is the recommended inlet and outlet size for this?
3. does the bullet's location affect the torque/hp?
4. which muffler suit me best, as i'm looking for a deep bass sound (not too loud ofc)? does i have to find an exact inlet size as my piping as well?

Thanks sifus.

1st, thanks _Buyer for your questions. Seems a lot similarity to my curiosity as well.

Anyway, as i read a few posts by shinjite and lowyat82 regarding his questions, I've tried to get some quotation from few local brands exhaust distributor and the price is shockingly, quite expensive as well.

By the way,

low yat 82 did mention to check for some local brands' midbox such as topcat, matola etcs. Any specific reason to this? Are they really compatible with local made cars in Malaysia? inlet/outlet need to be the same as piping as well?
how do we classify a good muffler? is it a must that the muffler inlet size needs to be the same size as piping or else will kacau the air flow? Btw, i saw some same inlet size with different body size. Is this affect as well? (pic included)

Thanks Otai2 
ps:
1. i asked few shops while requested for price quote, and they said that lowest exists inlet/outlet for campro is 1.8" which is the standard one, not the performance one. Is this true?
2. just joined LYN, as i'm so noob and penniless to fail on my 1st attempt. 

[attachmentid=2777977]

Heed shinjite advise. Muffler,midbox is okay, but not piping unless got other mod.

1st, like PedoJokerBear-XII thanks _Buyer for his questions. i have some question here. my car is an old honda accord ca1 and need to be change due to its rusty condition. so im planning to get a new exhaust system with good fc on it and less noise. my current engine is carb A18A with auto transmission. what is the recommended setting for it? if perodua and proton have hotbit, powerzone, marco what brand is suitable for old honda? TQ!

Hey guys, anyone know the price for Superstreet Campro IAFM extractor?

I plan to change my extractor first, will. I feel any difference?

My car is Gen 2 1.6 Auto Campro IAFM engine.

Really need help on this.

Hi all sifu,

- My setup 4-1 extractor with flexi, 2.5" center bullet ( from kweng84 ), HKS silent high power 3" + front to rear 2.5" piping. All parts is from kweng84 except the muffler bought at chop shop

Engine setup : 4G93 DOHC Duratech 272 degree Camshaft, Apex'i open pot

Problem : Exhaust got cracking sound after 4.5k rpm. Happen after change new extractor and piping and bullet. at first tot is the rear exhaust but after replace still happen. Checked no leaking. sien liao 

145hp on wheel. Torque not remember, hav to dig out my dyno chart.