could be something to do with your gearbox? was in my mates pug today and he has a similar problem he recons one off the gearbox bearings has gone?
wierd noise when i let off
Are you sure you haven't just farted?
does it happen at any other RPM?
could be compressor surge
i havent personally been near the flywheel but ive only had the car about 2 months its very juddery when starting of in first though.