I just got my IS, would like to know if anyone with a stock or NA removed their CDD and what the 1/4 ET difference was. Ran a search and found what needs to be done, but no actual testaments as to what the removal of that damned choking device yields. It is quite annoying that my car will make me lower my rpm to 3200 or so in order for me to up-shift. I got my manual to gain control, not to push a stick around. Very dumb move on the part of lexus imo issed: .