Woofer
https://www.crutchfield.com/p_136112LGW3/JL-Audio-CS112LG-TW3.html?tp=112
Amp
https://www.crutchfield.com/p_13698362/JL-Audio-JD500-1.html?tp=35834
Harness
https://technicpnp.com/product/toyota-supra-hifi-option-676-add-a-sub-harness-loc/
Pretty easy install after figure out how to...
I ended up buying the pnptechnic harness and a JL audio amp/sealed box (high end one) and it sounds fantastic now. I also coded out the ASD with bimmercode. Highly recommend
Well I ordered the plug and play adaptor mentioned above and a nice sealed JL Audio 12 in sub/amp. Will install next weekend, I will let ya know how it sounds. May eventually need to upgrade the rest, but I like to move one step at a time
I have scoured the forums looking for a definitive trajectory for upgrading the audio on non premium cars, there is not a lot out there. One thread mentioned a hiss due to the receiver output which it sounds like he coded out.
Has anyone done this successfully? I am going to a local shop but...