Rich-D
ClioSport Club Member
E90 LCI 330d
Ok, I know that a 4-1 and a 4-2-1 manifold both give a nice increase in power and torque, but with different gains...
One gives more low end grunt and the other more peak performace, or so I am told.
Question is, am I correct and if so, which one does which?!
TIA