There is no need to ask questions. Let me tell you a little story about Aaen Performance... I've had many pipes made from them. You know Elana? The secretary? Nice lady. You talked with Olav? Nice guy. Did he give you a spec sheet on those pipes? Raise the exhaust port 2mm... widen 1 mm?? How about a serial number... Did he measure the chamber o.d? You realize he isn't the one who actually builds the pipes he sells. I bet he told you to run them at 9250. Have you ever put those pipes on a run at Dynotech? They don't make power. You will lose power. They shed weight and sound good, that's about it. I've been dealing with Aaen and their "kawasaki" pipes for quite some time. Don't believe me? Want a few more names? Yes, you can make your own decisions... whether you want to run those pipes as Interceptor pipes. I have a set of Interceptor pipes on my bench right now and they are physically not the same as the ones listed. Just talked with a guy the other day from Wyoming who races Interceptors (very knowledgeable) and hasn't had luck making power with their pipes either. I looked at the pipes listed on ebay... the step "increase" should be where the front tube blends with the center chamber. In other words, the Invader and Liquifire chamber should be "smaller" than that of the Interceptor. Without part number stamping and comparable pipes it just turns into a "he said she said" battle.
Here's the thing... I don't pretend to have all answers. What I can tell you is I do have some experience with those pipes and tuning Interceptors. I've had Aeen pipes on my Liquifire and Invaders also. In fact , I have a set of Aaen LTD pipes in the garage right now. Been there, done that. If you don't what to believe me, that's fine... good luck with the sale!
By the way, nice pic! Looks right at home in there...