The stock air boxes on the 1400 are somewhat restrictive. Many have 'uncorked' the 1400 and, if done properly, you can gain a noticeable amount of performance. Usually it is done by just removing the air boxes and installing pod filters; the properly part involves the re-jet. The engine, like many, is lean from the factory, and increasing air flow requires increasing fuel. Just replacing the main jets isn't enough; the jet needle/needle jet has to be addressed to make sure the mixture is good across the rpm range, and the pilot jet sometimes needs changing, too. It really helps to get it right if you know someone with a dyno that has an exhaust monitor. A fancy-looking CAI system looks cool, but helps little over the pod filters, and, given how little room you have, is a lot of work. I've seen photos of Intruders done this way, though.
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'68-7? CB450 and '98 Valkyrie Tourer, too