ZR2 Exhaust

[AirRyan]

I can confirm that my zr2 I purchased on September 9th, came with the Borla exhaust from the Factory.

Looks like the dealer just installed your Borla aft of the original muffler! You're running two mufflers?!

 

[scubatech]

Looks like the dealer just installed your Borla aft of the original muffler! You're running two mufflers?!

The Borla "S" system has a resonator behind the Borla muffler. So it's correct. Mine is just like that and I have the stock exhaust system sitting in my garage. The "S" cold started inside the garage sounds like a C8 to me. I think the ATAK has no resonator behind the muffler.

 

[AirRyan]

The Borla "S" system has a resonator behind the Borla muffler. So it's correct. Mine is just like that and I have the stock exhaust system sitting in my garage. The "S" cold started inside the garage sounds like a C8 to me. I think the ATAK has no resonator behind the muffler.

I see it now; the main Borla muffler is in pic #5. I was looking at Borla's website, it looks like it is maybe Borla's 140914 with the mid-level S-Type sound level?

In a former 2017 GMC Yukon Denali 6.2L that I had, the go-to muffler swap was the Magnaflow 12909; there are a bunch of good reviews on that muffler with this motor. I put it in my Yukon when it was relatively new and never had any issues with drone. I did keep my flapper valve on that vehicle, though. I see that on the Borla kit there is no flapper valve and I trust that there is no drone? I ordered a M/F 12909 and am leaning on omitting the flapper valve when I install it.

 

[securityguy]

I see it now; the main Borla muffler is in pic #5. I was looking at Borla's website, it looks like it is maybe Borla's 140914 with the mid-level S-Type sound level?

In a former 2017 GMC Yukon Denali 6.2L that I had, the go-to muffler swap was the Magnaflow 12909; there are a bunch of good reviews on that muffler with this motor. I put it in my Yukon when it was relatively new and never had any issues with drone. I did keep my flapper valve on that vehicle, though. I see that on the Borla kit there is no flapper valve and I trust that there is no drone? I ordered a M/F 12909 and am leaning on omitting the flapper valve when I install it.

Two things: 1. Magnaflow are EXCELLENT mufflers. 2. REMOVE the flapper valve!

 

[grainey28]

Had the huge factory muffler with flapper removed and installed a new 3” inlet/outlet Flowmaster FX in mine yesterday. Sounds absolutely perfect. Growls like a Vette when you’re on the gas, but hardly noticeable at cruising speeds. Added a K&N Cold Air Intake as well. Made a considerable difference in sound and performance.

Do you have a video with the sound ?