I have myself choose all the A in my list, which generally no 1 wants it. Reason?

1) Market always tells you 4-1 guding and cheap, hence everybody goes 4-1 extractor. The same amount of moolah u spent on a full SS 4-1 extractor probably still cheaper than a black steel pipe 4-2-1 extractor

2) When u tell the ekzos sifu u wanted a chambered midbox, he'll ask u rather keep the stock box. Reason? General public always talk about high flow and forgetting how small your engine output is. 1.3 for my case? and your unmodded 1.6 kampro that came with a CVT box which require feedback. So, go ahead and do what other people suggest u to do, a bullet. My pick is still A, a chamber resonator, but that came with an expansive price tag. So, probably going for B, swirl flow like farting all the way.

3) Stock chambered muffler? 9 out of 10 ekzos modder aim for SOUND. As for power output, butt dyno is enough. Got the sound ady, automatically FEEL faster I seldom see people will go dyno for an exhaust mod other than those few that I got my data from. The reason I go for chamber muffler got only 2 reasons, 1 is the drive the car with stealthyness(as silent as stock muffler), another thing is chamber muffler got no muffle material use other than the chamber itself. So I can continue the stealth driving until the muffler rust a hole on it

So, you do not need to wait for me to mod. The data is already given, and you may pick your stake from there.

Edit: FYI, just incase if you're interested to see

Here's the cut out of performance chambered muffler


Compare with stock chambered muffler

Tak payah IMO. Sudah chambered, lagi kasi bikin tabung buat apa A better choice is maciam drfeelgood is swirl flow tengah + bullet BUSAQ, belakang bikin S-Flow. Mau lagi garang, tengah carik jenis bulet yg separuh swirl separuh straight. Suh itu tauke ekzos kasi terbalik install, straight hadapan, swirl feising muffler belakang.

Lagipon, bukan cakap powah loss. Ekzos mod sudah bikin mmg ade powah up siket mia, kecualikan terlampau busaq itu piap paip. So klu hang trus tukak straight/swirl flow tengah, RPM rendah susah naek ciket. Tapi tengah+tinggi manyak garang sebijik maciam perompak bank mau larik polis