I personally wouldnt feel safe removing 4 pounds of material from a stock flywheel... just doesnt sound like it would be so strong especially if youre adding power to the engine.... why not go with a new one from spoon or toda? they are steel instead of aluminum. I installed a spoon one in my friends ls/vtec and i love it! you could have an old flywheel thats been lightened and weaker for $225 or have a brand new unit from SPOON for like $300!?! Clutchmasters makes awesome clutches that grip hard with light pedal pressure. The stage 3 can handle just about anything all motor or medium boost or juice and has like stock pedal pressure. thats just my $.02