Hi Z-friends, I have 2 '72 240Z, one with SUs, 6 to 2 header and original exhaust system and one with 3 Double SKs(with horns), 6 to 2 header, turbo muffler, Crane ignition, el. fuel pump, el. fan, add. oil cooling, but stock cam. #1 Z is my "elegant" Z, quiet, comfortable and it has a radio. # 2 is my beast: Loud, tough and with direct response. The radio that was in at first was the first thing I took off. The sound of the engine is the best music to me. Looking at a stop watch there is no big difference in acceleration or top speed while both cars have the original cam and head. Different are fun, fuel consumption (not that much) and maintenance. Finetuning the 3 SKs is a science of it's own, but I like it! Which car I prefer ? It's depending on the purpose , on the kind of roads I plan to drive and on my wife. She prefers the yellow/white (interior) #1 with ( basic original) leather seats to the racing seat and harness in #2, but there she misses the sound , the feeling and the attention from outside. Rolf