I had, but taken out by my mechanic later on. Some told me it's a surplus item for normal cars due to the engine vibration isn't that serious (unless you had a over 300bhp+ engine that rocks ur car hard)
I'm quite sure there are alot of ppl using Toyota Supercharger pistons on their GSR or 4G93 BOT. I guess there are also alot of ppl using it on reboer 4G91 and also 4G92.
I've read it somewhere in ZTH that ppl have installed a custom switch that disables the fuel-pump. It got my attention but I wasn't able to find one in Penang. Someone kindly point me to the right direction. :)...