Andrew, I think the BOSE in the Zed is great, on a par with the Logic 7 DSP jobby I had in my E92 I think. No distortion at any volume and very powerful (a huge step-up from the 350Z). Not heard the GT-R'sters version but heard a lot of complaints. I can comment on how it compares to the £5k 'mega-systems' in some of your recent motors but I've been very pleased with it. Perhaps the size of my cabin helps, maybe even the canvas roof, no idea but it sounds the bollocks. We'll have to sort out a 'sound-off'
. Perhaps swap cars for a week to really test the systems