LexZburk

I'm new to ClubLexus so forgive me if I'm posting out of place here but I am looking for a bit of advice/help. I recently purchased my first Lexus, a 2017 RC 350 F-Sport and am absolutely loving it. I recently installed an HPS intake (SRI) mainly because I wanted to retain the ASC option and it was the only intake I could find that would do so. Since installing everything appears to be working correctly, no check engine lights and performance seems on par with what is expected but I have noticed a soft crackling noise when decelerating from high RPMs. This is more noticeable when in one of the sport modes. I also switched out the stock air filter and installed a K&N air filter. I was wondering if any of you have experienced anything similar. I'm worried that I'm hurting the engine but I hope that isn't the case and that someone can give me peace of mind or at least help me understand what is causing this. Thanks!

Edit: Title should read HPS* not HSP

Pittsy

Is it an exhaust crackling noise?

LexZburk

Thanks for the reply. It does sound very similar to the crackle that you'd get from an exhaust but it sounds like its coming from under the hood. Like I explained in the original post, it happens on decel from high RPMs. I can try and get a sound clip tomorrow and post it in this thread if that would help. Thanks again!

Pittsy

That would be very helpful.

tnilc

it’s normal.

as you’re accelerating you’re sucking in more air. As you let go of the pedal the sucking stops and turns to the gurgle sound as the intake flow drastically changes