I suspect there are several minor issues here.
IVA Inspectors are probably required to follow normal type approval techniques in conducting field of view checks which wasn't always the case with SVA. ie rotating head but torso must remain in stationary position.
Small mirrors will have a smaller field of view from any particular viewing point.
I have also conducted a test with a small make up mirror which indicates motor cycle mirrors may not be suitable - with the mirror to my left just 18" from my head and with the right side of my face on the right hand edge of the image in the mirror I can see quite a lot behind my left shoulder and to the left of this! but when I move 50" away from the mirror and try again I can see very little of what is behind my left shoulder......
I wonder if this reduces the field of vision when using motor cycle mirrors.
As for the noise issue, I'm assuming Ash didn't use an SVA compliant muffler?
The trouble with straight through mufflers if they're
LOUD
but I would have thought SVA compliant mufflers would have been available for some time so being over the limit by 2db would be understandable but by 7db.hhmmm.
Does the tailpipe exit horizontally or is it angled downward?
BV.