Mine is definitely the trend of doing “catless downpipes” and “resonator deletes” making your exhaust super raspy as a means of gaining more volume rather than doing a proper exhaust setup. Especially since high flow cats these days will flow more hp than most are making.
I have do disagree somewhat with the resonator delete. It totally transformed how my M4 sounded. I also did a secondary cat delete. Primary cat delete, I agree, is too much, and I wouldn’t do it.
My least favorite mod is a roof spoiler on a sedan or coupe with the roof ending a significant distance from the rear of the car. They are absolutely worthless, creating more drag for minimal downforce. Roof spoilers are for hatchbacks, which applies downforce closer to the rear in a hatchback and a sedan. Worse yet, some people combo a roof spoiler and a rear wing. Bro, wtf are you doing?!