I've done this mod, pretty simple (hardest part was bleeding the hydraulics). I purchased a spare slave cylinder and did the mod to the new slave. Clutch engagement is definitely improved and I have yet to experience clutch slippage. I drive my car pretty easy, but... My Si is CT-e supercharged, and every now and then I get on it pretty hard; no slippage even speed shifting between 4th and 5th gears.http://*************/forum/threads/clutch-delay-valve-removal.8624/
heres the link. wanted to see if anyone on this forum has done the mod. sounds like it works really well.