Yeah I've seen that - look at the Y-axis on page 12!
Engine RPM vs RUMBLING NOISE..... All analysis like this points out 400hz damping 'cause that's where the ear will pick up the "rumbling noise"
Basicly says the same thing as the dinan article - but both Supras and BMW's are I6 engines so what goes for them may be a little different for us.....
