On that basis, everything that's commonly done to these cars is a big waste of money though.

Exhaust, doesn't really add power and never get use out of it on the road
Cams, Better brakes, 4.1 diff and better lsd, coilovers, reinforced racps etc all would be a waste of money if compare them to what you get out of them on the road to a carbon airbox.

But lots of people still do those jobs.


Don't really see how you never get to use a carbon airbox on the road either as there's a massive difference in noise from 2-3k up.

If never get the use out of one, might as well just drive a 320d

Would agree though, there's lots of ECUs and engines getting ruined by "Alpha N" tunes especially E36 M3s with lads not even going to the expense of a proper airbox and just getting a generic 100 euro ecu flash.