why wanna upgrade flywheel??... or u mean lightening it??...
flywheel is just a spinning mass which provides a gripping platform for ur clutch plate...
Guys, I have installed a set of HID my self last 2 months or so but surely less than 6 months. Then starting last month the (L) side HID sometimes won't turn. I've to switch off the lights and switch it back on again so that both side lights up. Some times, I've to repeat the same sequence 2~3 times then only it will light up. I gave the seller a call since its a new set, he promise he can change for me but he told me to use this method see whether it can solve this problem or not.