New to me EX37 with the VQ37HR...it sounds epic on cold start, with a nice relatively loud exhaust note! Then, after about 30 seconds, the rpms stay about the same...but you can hear it quiet right down. Boring lol.

Is this an active exhaust or how can the sound change so dramatically when it warms up?

I'm assuming this is something emissions related (likely to heat up the catalytic converter quicker)...but regardless, it sounds like active exhaust when it quiets right down. I'd love to keep it in the 'loud' setting :-)