in supraforums, one guy found he yielded the most power with the exhaust retarded 3* and the intake at 0*. his mods were, 3" downpipe back, greddy fmic, hks cam gears, safc, jdm map sensor, us 550cc injectors. i believe many of the 2jz guys do 2* retard on the exhaust and 1* advance on the intake.