Unless you are getting Akrapovic catback, i recommend the Active Autowerke axle back with catted downpipes. Thats the best sounding setup in my opinion. It also adds quite a bit of power due to the downpipes.
COMPATIBILITY
2020+ Toyota MK5 GR Supra (All models/trims/RHD/LHD)
Radium Engineering catch cans feature large 10AN ORB ports, a 4AN ORB drain port, 2-step oil separation baffling, and an O-ring sealed dipstick. These kits mount using factory holes and integrate perfectly with the surrounding...
Check out the MAD downpipe, it was our most popular option when we used to offer catless DP.
it also comes with a lifetime warranty
https://mad-us.com/mad-b58-downpipe-w-bracket-bmw-f-g-chassis-supra/
AA catted downpipe + AA exhaust is the most popular setup for our customers.
It provides a more aggressive sound with a deep mid-range tone.
it does use the valve system just like stock
Perfect for daily drivers
Lots of dynos posted show gains from downpipes even without a tune. here is one with the Jb4 on map4 (turned off). its a 340, same engine, same downpipe.
the intake on its own added 10 whp with the same setup, the downpipe added 20whp
here is a dyno with the intake without the downpipe
http://www.extremepowerhouse.com
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PRODUCT FEATURES
Direct fit for the 2020+ Toyota GR Supra, and 2019+ BMW Z4 3.0L*
5-7°F drop in intake air temperatures over stock
31% increase in core volume
48% increase in external fin surface area
Strutted tubes incorporated in core for maximum durability
Full aluminum, TIG-welded...
No damage done from using these mods without a tune
Sound will be improved and you gain some power.
I recommend getting the Active Autowerke catted downpipe to avoid the check engine light.