i guys....just check my engine bay...i notice that my car also  suffer the famous tak tak tak sound....and my iafm module has the yellow qc sticker on it....i remember i read somewhere in the thread where those with the yellow sticker just need to modify the iafm to solve the tak tak sound....true?? so far fc is pretty ok and i only can hear the tak tak sound if i open up the bonnet...won't notice it inside the cabin.

ust wondering, anyone had experience replacing the stock headers to aftermarket headers like 4-2-1 or 4-1, WITHOUT changing the rear and mid mufflers?

I need to know if by JUST changing the header and maintaining the rest like the mid and rear muffler stock, will the rear muffler emit any weird metallic / cracking noises????

I am asking this because i had bad experience with my ex car when replacing to aftermarket headers with the rest stock whereby the muffler emits a loud metallic noise.