^^^^
You're so right about sound, Mat. A close mate of mine (famous musician) came round last night and we got into a long deep chat about how we are all effected by sound and its quality - Not just in music and language, but any and every sound. Naturally I brought into our conversation the responses people have to exhaust sounds.
Bottom line is that sounds are energy vibrations which resonate positively or negatively with each of us. Furthermore, each of us has slightly different abilities to hear sound in its entire range.
And no! We both gave up the wacky baccy several decades ago!!
Much as I love both the APR and Blueflame sound on the GTI, my latest Milltek version suits me better (until I hear the slightly louder one when it's ready).
It's an individual thing
P.S. - I'd love to hear your Blueflame from inside your car one day, Mat