Never ran splits, but the local carb guru says it is worth a little in terms of it being a short shot straight into the runners. He (Gary Williams) has been splitting them for years. Last time I was there, I was looking at a LOONNNG dominator he had on an intake. Seems the rules for the customers class had changed, specifying no splits. So Gary joined the splits together, while leaving them spread out. Wild looking to say the least...