Flapper Removal Questions on 2019 Silverado 6.2L V8

[yankeesfan81]

I haven't done anything to the exhaust.  My only intent was to cover up resonators and possibly clamp open flappers.  Just to give it a little better sound.  

[Pk64f100]

I purchased my 2020 TB LT 6.2 with the performance Pkg this included a (cat back exhaust & CAI) the #ers are 435hp and 469lbs and cost $2,095 from dealer. This is all under factor warranty I do not know exactly the manufacturers but if anyone does I would like to know. The truck has the DFM, no drone, sounds great and runs awesome very fast for a truck, faster than my 2011 Raptor & handles much better. So if anyone can help me please do so

thanks Pk

[Pk64f100]

Here is sticker if this helps with the identification of the performance Pkg model names of CAI and Cat Back Exhaust. Looking for manufacturers names of each 

thanks 

[t-bone]

My stock muffler and flappers are getting removed. Replacing with a 3.5" Dynomax Ultraflo SS muffler and keeping the resonators near the tips to manage drone. AFE Momentum CAI is replacing the stock airbox. You need to disconnect the battery for several hours after installation and drive for a week or so for the computer to relearn. CAI and full 3.5" system back to the axle will lean out the factory rich air fuel ratio. The increased air flow mostly helps at the top of the power band. I will post a video with sound when it is complete.