Here's the various ESS kits listed in the Dyno Database (
www.bmwdynodatabase.com). I tried throwing out the outliers both top and bottom. All of these results come from a Dynojet with SAE correction.
ESS VT1-535 (~7 results):
454-490whp, 301-326wtq
http://www.****************/DynoDB.ph...1&EngFIOpts=60
ESS VT2-575 (~4 results):
455-481whp, 297-311wtq
http://www.****************/DynoDB.ph...1&EngFIOpts=61
ESS VT2-600 (~10 results):
510-580whp, 328-372wtq
http://www.****************/DynoDB.ph...1&EngFIOpts=89
ESS VT2-625 (~5 results):
558-594whp, 375-381wtq
http://www.****************/DynoDB.ph...&EngFIOpts=146
ESS VT2-650 (1 result):
604whp, 386wtq
http://www.****************/DynoDB.ph...&EngFIOpts=153