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If it's not really about tuning or wiring. Then it belongs in here.
I have a 2018 Subaru wrx sti recently when it started to get hot outside everytime I start it, it takes awhile to turn on and it sounds like the battery is weak but it's not. I have a Cobb intake and a catback invidia r400 exhaust with a Cobb accessport that I installed last summer and fog lights I recently installed a month ago.
It's a little hard to really suggest what the issue might be here. Have you rescaled the MAF table to suit the new intake? Or are you running a Cobb OTS map to suit your modifications?