Guys, my last setup is like this -

Extractor 4-2-1, straight bullet and S-Flow muffler. Hooked to a 2010 Persona Elegance Auto. All ayam brand stuff.

After driving for a few weeks (80km back and fro to work), cannot tahan the sound so I went back to the shop and add another bullet and walla! So much difference does is make!

My Q is...
1. Most of my (internet) reading said it is best to go for 4-1 for manual car and 4-2-1 for auto, how true is it?
2. Changed to a used 2014 K3, I've asked around BM, Penang area and one reputable shop had recommend me the whole package at around 2.7k. Is the price OK? They'll use aluminium/stainless steel material (cannot ingat which)
3. There are a whole lot more sensors in this car compared to my old Persona... how is this going to be affected?

Different brand by the looks of it. But I'm sure the size is about the same

Low rumble... Just a bit louder than stock. Skeptical at first but it actually works for me