the e-trim is a bigger compresser wheel, which may take longer to spool. When i talked with turbonetics, they said the etrim is not always better that the basic btrim. I'm sure both will produce about the same power untill you get into really hi boost
B trim has 7 blads spools little quicker.E trim has 6 blads spools little slower, makes more power at top end. our motor will run just fine with b trim. E trim will be little laggy.