This is a question that I have wondered if any one has tried and has facts to report on. I noticed the F430's with the F136E and F136ED engine has very short (1/2') velocity stacks in its manifold, yet the ED has 503hp. My '09 California with the F136IB,and the rest till '12, have these 90 degree arched velocity stacks that are about 4-6" but the car only puts out 454hp. I do understand the variations in the engines but I was wondering if any one has removed the "trumpets" from the California manifold and to what affect? Positive or Negative or no change? I suspect loss of some torque, more engine sound and better top-end. Anyone have any hands on experience? PS-Mine is far from stock already. Cheers!