Wow, that does take big cojones, cut dashboard, in proximity to airbag and other wiring, wow! Wouldn't there be danger to get rattles (even if it is just stuff like sunglasses bouncing around in there)? Wish we had a sunglass holder above the rearview mirror in the headliner...
2011 BMW E82 1///M: AW, all options; Renntech, Akrapovic, Forge, P3, RevoZ CF bits, many mods
1988 BMW E30 M3: Hennarot, S14, stock
2016 Porsche 981 GT4: Guards Red, LWBS, SC, full leather
1998 Porsche 993 C4S: Zenith Blue, last aircooled widebody, Bilstein PSS10, Fister II + Fabspeed exhaust
2008 Audi B7 RS 4: Sprint Blue, Audi Exclusive Euro Bucket Interior, Premium+Titanium, many mods