Good points Jack!
Another thing Bill looks at when writing tunes for cai's is that each mfgr places them "generally" in the same area. But when the cai went through r+d the mfg looked for the optimum placement of the maf in it's cai. From what I understand of looking for their specs the placement may differ an inch or two or three from which ever mfg you chose. Thus the flow of air may be different at that area. Also alot of mfgs test at WOT. Find a cai mfg that tests all the way through the rpms and for DDs not for racing.
Lars
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