Mine doesn't seem to have too much lag - I hear lots of people complain about it, but it doesn't slow me down through the hills. But yes, the valve body upgrade fixes that entirely, and I am going to have it done soon. I have been kinda thinking I might just wait and do the whole $2,500 valve body + high stall (modify standard stall converter) + kevlar plates upgrade done all at once, rather than bit by bit. However, so far the mods on my car have gone very slowly and I have no real need for it yet. Then I keep thinking sooner or later I wll grab an R34GTR so it might not be worth it anyhow .... but I never know what I'm doing one minute to the next