Does anyone have experience of the increase in 'throaty roar' from changing the factory filter to a K&N trumpet? [/quote]
Yes (hope a cone filter is acceptable).
Nice sound.

Attached Images
image.jpeg (196.38 KB, 135 downloads)
Last edited by The Austrian; 06/07/16 10:49 AM. Reason: pic added
Hannes
once: Green M3W; 2013
now: Red 4/4 Sport; 2011
and some practical cars for use in real life