just finished my new exhaust setup at kweng (wai heng kaki exhaust serdang HQ) not too long ago. fully stainless steel, 4-2-1 extractor, 1.6" piping, 2" oval mid bullet, sflow muffler

all an all, really damn dirt cheap and cheerful setup for MYR770 lol

Really loving the sflow back pressure/scavenging effect, i can see how this shit can dramatically improve my FC already.
RPM doesnt drop like a rock and i can just let my foot off the accelerator. the car still continues to hold its RPM and speed. which feels amazing LOL

of course, pros and cons, while the low RPM/power band is awesome, my upper power band/top end suffered
torque didnt seem as high as before after the 5k rpm. havent got the chance to fully try it out though.
that, and Malaysian roads' traffic jam, i guess i *CAN* live with some minor setbacks ^^;

oh as for the noise level, from within cabin, A TON quieter lol. and engine vibrations seems lesser maybe cuz the car breathes easier?
from outside especially near the muffler, it seems noisier. i think i can conclude that, the exhaust pitch is lower (more bass/less treble per say)
lower pitched sounds are harder to notice after all, especially within the cabin with more "resistance" from it.