had to change mine too during a few months ago..due to leaking..
still shiny ey, u change oil on time n never late? 
wat caused the bocor n bakar? u careless or u core rev driver?
dats quite big bills man.. 
this is always subjective... no perfect exhaust setup.
some setup gives u top speed but less pickup.. some setup gives u power but bad fc..
some setup give u good fc but so-so performance.
for me, stock setup is for balanced performance...FC n performance 

Yep, I prefer the current exhaust setup as well as I travel 40 on highway speed as well.

Mod-ding exhaust means removing the catalyst converter, a big no-no for my "environmentally-friendly" life. Some say the converter is gonna expire sooner or later, so change also ok.

Its like saying since we gonna die sooner or later, may as well die now, not a philosophy I agree with.

4-2-1 gives better low-mid end torque but skimped out on high end speed while our stock 4-1 is good at mid-high end performance (that's where campro actual optimal torque is at, anyway).

If low end torque performance is what you want, just change the plug and play Lighten Crank Pulley from Works Engineering or better yet, Mytheo.

For example on City where the low end torque is already strong the effect is minimal. For campro where the low end torque is weak coupled with heavy weight of car AND dated gearbox and ratio, its godsend. If I were to take out my LCP, I will switch car, that's the measurement of effect of LCP on our auto PE.

using hotbits 4-2-1. only extractor. stock for others. auto also.
haha, your car super edi mah. got sound proof, good audio, good looks.
I am using GM concept. At first budget suit only for alpha. but then after listening to the difference where I prefer the concept, I stretch my budget further since is for long term.
LCP work very well for campro. due to the chracteristics of campro the car will go rev higher to get power.
with LCP the car rev easier and you will get the power at a lower rpm. this means the car will be very comfortable to drive at low rpm.
what is the mileage of your car?
your car producing sound after LCP change is it?
mine got.

i assume you have GC and VS. i personally think that 2 add on helps improving the lcp effect of low end torque and shifting.

there are a few things you will notice depending on the age of your car. sound may include belt slip sound, light vibration sound, and other possible sound depending on the condition or age of the car. when I changed to LCP, my belt slips during cold start. only after my changing of the whole set of timing belt service which includes the auxiliary belt, tensioner and blah blah blah, the sound is gone and the belt doesnt slips anymore.
if you concern more on low end torque, 4-2-1 is something that you really want. not advisable if you are frequent highway though. You get very good fc compared to stock on 4-2-1 in the city but not better fc on highway.

prepare at leas Rm600 for that i think.
yup. it works great. but kena poison T.T if can add an amp. I personally think the amp help a lot.
i understand the vibration inside the car, it is crazy. I do soundproof 4 door and hood, but not at EA lah. budget one. result not that great but still good. but then it makes me hate the interior. unless the music is on louder otherwise the sound is unbearable. your partial soundproof means how?
yah, 80k only change. i got consult drex, he got mention belt slip after installation of LCP during cold start is normal. I did not care about it, until after I do my belt service, i realise the sound is gone.
LCP got 2 brand recommended, works engineering cost rm350 i think, mytheology Rm550 i think. mytheology have harmonic dampener. somehow it doesnt create vibration for me.

4-2-1 have better fc in city due to the gain you have from 4-2-1 is the gain from low range to mid range rpm. When driving on highway of 110kmh, you are already at 3k rpm which is the gain become lesser as you speed up. better pickup is not real depending on how you define pickup. 4-1 have more huge gain in pick up when you rev up high. it is very good for drag. our stock are actually using 4-1. I think if you change to a good 4-1 extractor, the characteristics of the car will not change. but you have huge gain compared to stock. assuming your footwork is the same, yes, you can have better fc.

comparing fc figure of stock(4-1) and 4-2-1, basically is which one you want to forgo.
For example when I am using stock, my city driving give me Rm0.18/km. highway give me Rm0.15/km
when I am using 4-2-1, city i get Rm0.17/km, highway give me Rm0.16/km.
so it depends on which you want lor.

GC is grounding cable.
VS is voltage stabilizer.

yah, 80k only change. i got consult drex, he got mention belt slip after installation of LCP during cold start is normal. I did not care about it, until after I do my belt service, i realise the sound is gone.
LCP got 2 brand recommended, works engineering cost rm350 i think, mytheology Rm550 i think. mytheology have harmonic dampener. somehow it doesnt create vibration for me.

this is somehow a booster cable. it is too boost your altenator. basically work like grounding cable and voltage stabilizer. a good altenator booster cable should be able to give you a more stable current flow, smoother engine(electrical wise), and somehow reduce lag when the compressor kick in.

the advantage should be better gearshift. due to current flow better.

Feel like driving to Genting for fun. Anyone want to join?