Depends on what engine ... Not all engine use LCP well boom ur whole engine ... known many friends that use LCP dam many years and still strong running healthy dont just read reviews n judge LCP are not good . Dont judge a book by its cover yea ?

Dude, ive seen aftermarket "pro street" clutch covers which were supplied with allen screws..to quote you,  5 shithouse allen screws. Now thats gonna keep it all together eh?

Orh >.< i been using lcp for 2 yeard and my car has been half my track and daily drive car . Lcp has boomed my engine and it became Optimus Prime . Basicaly hks , m7 , Trd , works , arospeed , redline , mythelogy all can close liaw lor if its so bad ... And in world of performance modding without buying try and test it out trial n error u wont know which is best . U hoping people will share thier setup with u ? Lawl . Shoot me all u wan but.. remember that LCP are still
used worldwide by famous tuners and yah that 2 famous brands mentioned above heavier LCP i wanna see u use that in your car when air con is on . Track car an afford to use it cause they dont even have air con .

I have heard of most of those brand except PAR
Some more uncommon brand:Buschur Racing,Bulls Eye Power,OS Giken,ATS,Full Race

LMAO.. behind the car is a booth full of shit and a 200kg subwoofer.

Another thing I dont get is this :

Wheel (before)
Power  96 hp (72kw) @5868 rpm
Torque 130 Nm @ 4173 rpm

Wheel (after)
Power 99hp (74kw) @6141 rpm
Torque 129Nm @ 4378 rpm

Well, shouldnt your HP be higher (obviously) at a higher rpm? My car makes more HP at a higher rpms without an LCP
In fact right up to 4500rpm, your stock crank pulley is doing a better job than a lightened dampened billetted forged titanium aluminium hybrid alloy crank pulley with a piece of rubber. (LDBFTAHACP + PR)

HKS japan sold LCP few years back even before malaysian know about it . so how a big company would risk  ? as long the pulley is balance in some way how it could wreck ur crank ? wreak crank or crank oil seal my cause by improper instalation oil seal . when the oil seal is improper install it my cause the valve seal to worn out or the inner retaining wire in the oil seal may came off and scratch the crank hence crank damage and unrepairable oil leak .

so if using lcp could ruined ur engine so how about using lighten flywheel ? since it could effect the same way like the pulley ? some time the info u found on web aka information highway can be olso MISINFORMATION HIGHWAY .

err... myth lcp is a 1 piece unit with rubber belt slip in the groove... if u got see properly laa...
if u say the rubber will twist, means the whole pulley can twist???.... 
flywheel has springs??... cannot brain bro... got picture??... sorry for my noobness...

the lightened flywheel has the springs located in the hub of the clutch

now i get it .
either u are the chief mechanic at pagini factory or team renault f1 chief development and u never seen local paliah scene that most were homemade brew recipe . sorry to degrading you

sure u master MOM, DOM, KDM & struc mechs subjects..

Dampening the crank pulley is definitely a good thing, especially to absorb vibration, but in essence like what empire said in most of his posts, a lightened crank pulley at most shaves off 2kgs tops on a singular part which doesnt really make a significant difference on a mild or road spec car. dont get me wrong, 2kgs on a track car makes a shit load of diff, but those engines are balanced, blueprinted and stripped down after the race. Your crank and engine internals are not expected to last 100 000km as a regular street car is usually overhauled.
Its attached via a belt, even your crank has torsion stresses.
  this will definitely become unbalanced once the springs lose their tensile strength..how often does this need replacing? im guessing very..

There is a significant difference between a mechanic and an engine builder. Also an engineer. I remember a mechanic guy in LYN said he came up with a brilliant design to fit an intercooler to the intake of NA cars.. In fact he was selling the kit and installation service to other car owners.

The purpose? to cool ambient air to ambient temperature     

that flywheel is rather interesting..where can I get more information on it? Also is there any particular name for it?

ur flywheel so high tech miaa... what drivetrain u using???....   
ok.. so did u send ur engine for full balancing and blue print??.. i'm sure as an engineer u cannot tolerate any defects due to large manufacturing tolerance right??....   

wah !! speed2horison mali liaw . lolz
@ryan hustler u still havent answer my question , i only see alot of yapping and barking , and my older question i ask earlier why hks , cusco , knightsport , gfb , skunk 2 racing , aem , sells lcp ? no 1 answer me , instead i got a flywheels with spring , why does this big shot aftermarket made aftermarket lcp if its a risk ?

I don't think you understand Sid's argument. The point was "these companies don't have proper R&D" and the brands he quoted are all big names whom are well known to have their own R&D done on products they sell.

Anyway, regarding the discussion on the LCP and harmonic dampening - this is subjective. Race engines are stressed very much more than standard engines like yours and mine and hence their tolerance is very very small, which is why harmonic vibrations will affect a race engine. Stock Evo engines come with engine balancers to counter those harmonic vibrations that the engineers couldn't offset (probably at a reasonable costing) but aftermarket balancer delete kits are everywhere. Have yet to hear about any engines blowing up because of the balancer delete kit. Friend of mine had his Airtrek Turbo rebuilt, balanced and blueprinted. Removed the balancer and that was nearly 6 years ago, his Airtrek is still running fine. Basically I think it's about tolerance and how much is acceptable depending on what the application is. A stock engine or even a modded engine will not reach that level of sensitivity.

You deal with large manufacturing machines and I don't blame you for wanting to follow the same concept as those machines. For you any failure from these machines = money loss which is never acceptable in any organisation. So every meticulous detail you will consider - including harmonic dampening. Our street cars don't need this luxury and I honestly doubt a loose bolt will fly out and kill anyone anytime soon just because of supposed 'lack-of-R&D'. Malaysia is similar to China, if there is a product that's doing well, it'll be copied and rebranded. Does it mean there's no R&D? Not necessarily. The original product might have already done it and the copies are just leeching off the original idea since patents in M'sia are pretty much pointless.

I've been using a Myth pulley for close to 5 years now on my car. I don't own a workshop, I don't own a car parts shop, I am not a mechanic, I am not an engineer, I am only just an enthusiast. Whats more mine is a modified pulley which allows me to advance my ignition timing without touching the crank sensor (I'm using a VDO setup).

True. So that they can afford to fund engineers who thinks their funders are stupid.

Also,some well known 4G63 master refer Eric Hsu as Tooner

Haha... Sounds funny la you...

1)  Garrett stated something in the box... Please read the box and manual properly... Then start talking.
2) X CAI. I don't get what u meant.
3) A proper CF hood can break, but not disintegrate. Read your fiber and matrix.
4) The HKS camgear is the only camgear that will bit snap your belt due to sharp edges and material hardness. Also read the HKS manual properly on the maintenance and lifetime. Also the disclaimer.

RON98..? Please show me how you justify your RON98...? Unless you show me the container that states RON98. Then it's fine.... I think the best best person to ask is Drex Chan instead of you due to his educational background...

Pee and tsunami... Haha... I'm still convinced that u're a funny guy...

LCP does not gain more power... It only reduce the inertia for the engine to accelerate better for response. Please remember... If u're going for a true beast under the hood... Then, we should be talking about fluidmpr... It's one thing u should never forget. Not your OEM. I had my OEM Crank Pulley misaligned due to rubber gave way... I'm not the only case... I also have friends disintegrating the OEM crank pulley.

Calibrated torque wrench for engine assembly... Correct for the head assembly and partial correct for the short block assembly.
Why do you need plastic gauge when u can fully trust your TW.

Of course there are much more area u can extract power. It's the matter of cost...
Ok, I still think you should be replacing Rowan A. cause u're truly a funny guy.

1) do you think consumer are that stupid or the word "LEGAL ACTION" does not exist ?? u think those big company rather risk their name for a small profit like this ? u think people around the world are like malaysia's JASMA ???
2)cam pulley failure ? wooooo perhaps HKS = HONG KONG SPORT FROM CHINA that been mistaken for HKS japan ? , imitation in malaysia no need me to write out load here la , every1 knows or perhaps the mechanic/tuner farked up ? 

3)there are a saying , once u start to bump up the horses from ur engine or changing stuff that u deemed better , u already increase the risk , if u can bump the power the way u did do you think those  engineer that do r&d at the factory dint figure it out ? why doesnt they do it ? u bump ur evo X to 380 horses easily like u claim then why Mitsubishi doesn't made the evo 380 horses from the factory ?  yes u can say cost , enviromental but doesnt u realise 1 major point ? RELIABILITY , DUHHHHHH 

4) WAHHHHHHHHHHHHHHH lab cal-ed torque whench wor ,
i wait the world greatest invention to announce the torque whench of ur to be the greatest idea/gadget to human kind
then those people that massed produce plastic gauge and feeler gauge can shut down thier factory go home eat maggi liaw 

lol u really a joke 
u make me laugh like a idiot 
WAKAKAKAKAKAKAKAKAKAK   

1)if for those small company yes , but what is big company ? , those company establish their brand for more than 30 just to ruin thier reputation ? as for ur range rover its like proton , what to argue , car manufacturer does make mistake , one year or two years back ? toyota massive recall ? toyota wor , big brand wor ? mitsu back in 90's ? rusty roof , doddy auto gb ? lancia back in 80's rust issue , chevy in 50's unreilable auto gb ?????

2) i see u agree with me , thank you

3)can you remind me the extra money have to top up for it ? hmmmmmmmmm ? with the money u add for it i can say many tuner outside can proudly get more power from it but it sell wells and people buys it because it the money u paid for the extra enginnering  , so whats ur arguement ?

4) may i ?

u dint wrote that ? let me highlight 1 more time

yah maybe its me that is not very well educated
but i understand from that sentence is that as u assemble ur engine bottoms up using ur lab cab torque wrench   

Which also written in their website.
1)obviously big companies will take risk for profit. But there's always a balance between profit and reputation. The risk are majorly on the production vs demand.

2) agreed. Fake stuff has bad QCs...

3) Fq series. Let's check who is the company that provides the warranty. MMC or ralliart??? They are different division.
4) does the torque of te main studs affect the clearance??? Hahaha.... So, do you torque the bottom according to the torque or the clearance... Get ur hands on my friend. Then u'll know why I say that...

So, have u been pumping RON98??? Where??? Thanks for your information. Cuz we don't get it in Malaysia. I detuned my aftermarket ECUs to take so called RON95.