Finally got the lightweight pulley installed today. It was really PITA to remove the bolt of the crankshaft pulley. But after trying and trying, finally got it out and installed the pulley successfully. My initial impression was the engine seems to rev much faster and engine vibration seems to have been reduced. Anyway, we will know for sure in the coming days how it affect the performance of the car.
However, I was not able to install the alternator pulley. I can't remove its bolt without a proper tool.
Btw, this lightweight crankshaft pulley only works for the JDM 5th gen legacy 2.5i and 2.5GT. But I've found out when I ordered the stretch belt from US that this will probably work for the USDM latest generation Impreza, WRX and Outback as these cars also shared the same parts or stretch belt.
Last edited by Gborja888; 03-02-2013 at 06:56 AM..