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· Premium Member
18 Posts
Discussion Starter · #1 ·
I apologize if the title is kind of confusing. I have a 2016 Challenger Hellcat with the legmaker intake.

Since it’s summer and I’ve had the windows down, I’ve noticed lately when I down shift into 1st or 2nd and I’m still going a decent speed (thus the car still being in the 3-4k rpm range) I hear a very slight hissing, air rush type of noise that disappears after the 2k rpm range. Mind you, this is with no acceleration, just downshifting and keeping the foot off the gas. This is not the same noise that all with the LMI have of slight throttle and the air wooshing sound.

I’ve disconnected and reconnected all fittings of the LMI and they are all snug and there doesn’t seem to be anything wrong with any of it. There are no CELs or anything, which I would think an air leak or boost leak or whatever would cause. Upon doing a WOT test, I’m still getting the 8PSI of boost I normally get (high altitude in Colorado, it sucks) and there doesn’t seem to be any loss of performance that I’ve noticed.

I’m not sure if I’m just over thinking it, or if it’s just a different sound or something. I just figured I’d ask and see what everyone thinks.

Thanks all!

· Registered
2017 HC Challenger. no tune----yet.
535 Posts
overthinking it. You don't hear that sweet sounding whapah.... sound when you let off and the throttle slams shut because boost is bled off back into the intake stream instead to the atmosphere where a pop off would on a turbo type application. Iwonder why no one has come up with a modification for that so you could convert to a traditional pop off valve. Now I'm probably over think ig it...............LOL
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