2015 exhaust and intake upgrade issues

[headpan]

ok

first off thanks for helping me out ,

I have a 2015 silverado with the 5.3 engine

first i did the borla cat back exhaust system

then I put on the K&N cold air intake kit a week later

well at certian times, you can hear a whine/growl coming from under the hood.

anyone else hear this??

did that huge stock intake hide sounds?

all I want to hear is im not the only one hearing this

[morrislee]

Do you still have the flapper valve? if not, it is called droning, it happens when the engine is in V4.

[USAFRET]

It's the CAI. The stock intake is designed to reduce noise. I removed the CAI on mine because it was too much for me...much better with just the Borla exhaust!

[Jordan18]

On my previous 2 trucks this occurred after I installed a CAI and throttle body spacer, seems to be the norm with the setup. Almost like a poorman's supercharger/turbo noise.

[dsdesign]

I just bought a 2014 1500 w/ 5.3L and noticed the same noise coming from the K&N CAI. It's very odd since it makes more noise at low RPM and less up top when accelerating hard.

 

To the OP, what do you think of the Borla catback? Any drone when the truck switches into V4 mode?

[Spurshot]

The OEM intake tubes have what is known as a Helmholtz resonator. In simple terms, the intake air is pulsing because each cylinder intake valve is opening and closing. At certain rpm, the pulsing resonates with intake and becomes very loud. The Helmholtz resonator is a plenum that has a port into the main intake tube. The pressure pulses go into the resonator and bounce back and cancel the pulse. On the OEM intake tube these plenums are the square box-like shapes. Contrary to popular belief, they don't restrict flow/power.

[headpan]

so its not the flapper valve ?

whats a CAI

 

so it is what it is ??

[Jordan18]

so its not the flapper valve ?

whats a CAI

 

so it is what it is ??

 

CAI= COLD AIR INTAKE

 

I believe it is what it is.

[headpan]

ok thanks

 

someone told me of a custom tune to shut that feature off

anyone hear of 5star tuning out of SC

[Donolie]

ok thanks

 

someone told me of a custom tune to shut that feature off

anyone hear of 5star tuning out of SC

You can turn off the AFM or Active Fuel Managment with a tune, but the noise from a CAI or Cold Air Intake can only be solved with putting the stock intake box back on.

[headpan]

i was told the noise is the 4 cyliner shutt down

i was told if i turn that feature off the sound will go away

also a flapper valve

 

if im wrong just lemme know

 

i love the borla sound and peformance gains