I hear the NMS sticker adds 5bhp no? I added two for good measure!
As per the inserts, I did mine after Greig wrapped them, and I thought pah, I won't need to disconnect the battery a'l be fine...yeah, don't think the neighbours were too please with my horn going off for a solid 45 seconds as I wrestled the bottom cover out. Still, don't think the seagulls will be back anytime soon