I have a rumble amp too and what I do is use a bluetooth receiver similar to the on you linked in your update and a wired headphone connection into the 6.3mm jack. I use a 3.5mm to 6.3mm converter to hear what I'm playing and music I may want to play along to.
Get one of these Bluetooth to AUX adapters for your car. I also drive an older car that has an aux input, but is not Bluetooth, so I use that to connect to my phone.
I have a 2008 G35x, I bought a generic Bluetooth adapter with aux from amazon and I have that connected to my car via a rca cable, its been working really well. this is the one I bought
https://www.amazon.com/gp/product/B08KY684PB/ref=ppx\_yo\_dt\_b\_asin\_title\_o05\_s00?ie=UTF8&psc=1
The Tour adds wifi connectivity. So you can access the streaming only content on the radio itself. I would get the Roady, because it's just a better radio. Less money and it boots up faster.
The cheapest solution would be to get yourself one of those cassette to aux adapter things. And that's what I would recommend. If you need bluetooth you can also pick up one of those aux to bluetooth adapter thingies.
Don't buy a cheap stereo to have installed. They're just crap, and tend to die because they're cheaply made.
A SiriusXM ready stereo usually doesn't include the actual XM tuner and antenna, you have to buy those separately. So consider that in your spending budget.
For some of my MINI customers that have Bluetooth compatibility issues with older models, I recommended that they use an Aux dongle like this
What year is your Mazda? Does it have a headphone jack? If so, this one might work for you
Thanks, I can’t quite figure out the spitter and how that would work, lightning port goes into then phone mounted on a magsafe mount. The an aux to aux cable goes into the splitter and into the aux port do the car? And the lightning to usbc wires from the spitter to the cigarette car charger?
I think the wire option would be good vs. Bluetooth and not having to deal with pairing etc.
Edit - is this the type of thing you were recommending - COMSOON [Upgraded] Bluetooth 5.0 Receiver for Car, Noise Cancelling Bluetooth AUX Adapter, Bluetooth Music Receiver for Home Stereo/Wired Headphones/Hands-Free Call,16H Battery Life-Black+Silver https://www.amazon.com/dp/B08KY684PB/ref=cm_sw_r_cp_api_glt_fabc_394YNQM9J22D4ZRZB209?_encoding=UTF8&psc=1