Wow, if there is a leak on the clean air side and the exhaust side, that could be your issue. It would be pretty hard to feel a leak on the clean side at idle too, unlike an exhaust leak, because it wouldn't be pushing a lot of air.
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By the way, here is the kind of clamp I always liked - and I pack the shit out of them with copper RTV. You should be able to get one in the exact size you need whether it is smooth or stepped. You can't get them at normal auto parts stores, but I used to get them at the local truck parts store. Summit and Jegs have them too. They are a bitch to get apart once the RTV cures, but they seal pretty good. Just make sure you let them set overnight, because on a boosted system, they will push the RTV out if it is not cured.
-Geoff