Here, I posted a video of a straight piped supra driving around town. See............ I told you it's not that loud. Don't be such a puss, go straight pipe.
My straightpipe sound like this...... Bbbbuuuuurraaahhh...stutututu... Vrrraaaaaaaaaaaaaahhhh.....chchch...........bhraaaaaaaaah. See its not so loud, trust me. Hope that helped
Had to look again........ thought you were talking about carbon build up this whole time. Never noticed the that the tips were completely different haha.
Shitty oil, too much PCV vapor or previous owner swapped plugs and sold it........ I dunno.
Dump oil, swap to 5w40, run fuel injector cleaner, and fuel additives.
I mean, You checked yours and it didn't look like that, so you got your answer right there. Tell her to stop putting in dogshit fuel and run fuel additives so it doesn't happen again.