i30N N Garage Downpipe Sound Test (NO TUNE) | Exhaust Valve Spring Install

UPDATE 24/9/2024: Replaced the muffler with another stock PFL one, issue still persists... Looks like I'll need to get an aftermarket one at this rate to fix the rattle.

Items purchased:
https://www.ngarage.com.au/product-pa...
https://cherrytuning.com.au/products/...

Mods prior to downpipe:
High Pressure Fuel Pump
Spark plugs
IFX Intake

Notes:
I know the stock exhaust is great, but I had an itch for a bit more noise and was looking at the Q300. But turns out this is a great option, adding deeper pops and warbles with the addition of needing this for a tune in the future. I had an issue with the exhaust rattling once it was installed, people pointed towards the valve spring but it seems to still be there even after replacing it. I'll give it some time and provide any updates if things change.

I had the engine light come on maybe 4-5 times about the o2 sensor which I've cleared with a cheap OBD scanner. Since then I haven't seen any. Happy with the purchase and recommend!

0:00 Cold start, no downpipe
0:40 Sound test, no downpipe, normal mode
0:55 Sound test, no downpipe, N mode
1:07 Cold start, N garage downpipe, normal mode
1:56 Cold start, N garage downpipe, normal mode (close up angle)
2:50 Valve spring install
4:02 Idle sound, N garage downpipe, normal mode, valve spring replaced
4:58 Sound test, N garage downpipe, normal mode
5:14 Sound test, N garage downpipe, N mode