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'19 5.3l exhaust pipe size, muffler suggestions?

Donnyb313

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Mangano Enthusiast

Mangano

Posted
Posted

I bought a Borla 40359, deleted the flapper and covered the resonators and it sounds awesome. Deep rumble which I prefer.

 

The muffler shop that replaced the muffler said it would be same as factory. Ha. The Borla muffler is much "louder" and not obnoxious. 

  • 3 weeks later...
papasink Enthusiast

papasink

Posted
Posted
On 3/31/2020 at 2:29 PM, crazyjoefound said:

2018 & 2019 Silverado 1500 LTZ Z71's seem to have the same diameter stock pipe of 2.75" plus the 2019 has new tech resonators. I have both a 2018 and 2019 Silverado. On the 19 have done the muffler delete, welded in a 3 inch diameter pipe, and  covered all 6 screens (dual exit). The 18 has the same layout minus the new resonators and I deleted the muffler and resonator by welding in replacement 3 inch pipe. The 19 is much louder on cold start and through the rev range, but for less than $50 and a diy weld job the sound is great. Also removed flapper valves on both and with AFM there is a noticeable hum at speed, but the DFM hum is mitigated due to the exit of the exhaust being out the rear. 

Quick question on the dual exhaust for the 19.  I have the RST and want to just replace the muffler (I covered the resonators already and have the flap open) but looking at Super 10 and they have 2 styles with dual outlet.  Inlet is centered (#8425152) on one but offset (#8425810)on the other.  Which kind do you have, centered?  Thanks.  Love the "stock" sound but want a little more. 

 

crazyjoefound Enthusiast

crazyjoefound

Posted
Posted

@papasink I deleted the muffler and have welded in a straight 3 inch pipe. The pipe exits into a Y to the factory dual exit locations, and with the first muffler right after the cats then the flex-pipe having it "straight piped" into the said dual exit has made it louder that my '18 with only one exit. I will take a video showing the setup after work.

Mangano Enthusiast

Mangano

Posted
Posted

What I did is to purchase a Borla Model 40359 muffler,  ditched the flapper and left the resonators.  If you cover all six resonators it gets pretty loud and has some drone under load.  I hit pay dirt using 1 and 1/2 resonators covered on each side.

 

To cover them I used:  Thermo Tec 13575 12" x 24" Adhesive Backed Heat Barrier Thermal Pad Mat Tape NEW purchased on fleabay.  It can be cut to size and wrapped around them.  No slippage.

Screenshot_20200504-130615_eBay.jpg

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