[For reference] Measured: STi Performance Muffler (Low Back Pressure)
 

I've taken some measurements of the STi Performance Muffler for ZC for reference. I'll try to update it later on.

Part# ST44300AS020 (for 2017-21)

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That's nice. Now if I can only get one without selling a kidney.

Remember the hangers to prevent drone!

Done! Only 2 that came with were installed though & the other 2 were stock. Thanks to you on your prev. post, I had to ensure that the STI hangers were included.

Cold start sound levels measured: Ecutek-tuned STi Performance Muffler with Gruppe-S UEL, HKS dual resonator front pipe, & stock mid pipe. Ambient temp was around 5°C & the BRZ had been parked for 2 days.

https://youtu.be/Q0eF1DmV4Yg

It's still the best sounding exhaust IMO.

I especially love the low-rumble. The sound is very matured, classy, & subtle yet sporty unlike most that sound like tin cans trying to catch attention.