Testing moto exhaust mods | Yamaha Stryker #2

I have failed technical inspection with my Yamaha's exhaust being too loud so I've done several modifications to the existing COBRA slip-on to make it more silent.
I've got it used with the bike and I believe it was already tampered with (no foam or mesh inside) although I'm not sure it should come stuffed, but some info on the internet on other COBRA slip-ons suggest it should...

Also I've tried to measure difference in dB with the phone app (did a research for the best one) but ALL of them do not measure more than 90dB rendering this whole graph thing and testing useless :)

Silencer is 48mm in diameter, you can get one for cheap here: https://www.aliexpress.com/item/32835...

ENJOY!

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