Thanks all for your feedback on tyres etc. My day at Brands Hatch was fantastic. The Khumos performed excellent even though it was a wet track. The AIT mod was a waste of time realy buit all the other advice on mods was a great help. Thanks to Moto Build, the springs were great and kept me on the track when all hell broke loose. If anyone is looking for a good tailpipe with good power output and not excessive noise then there is an american company on e-bay selling a muffler that loops the gasses back on itself so goes into the back box twice. I would recomend it, and at £40 it was a steal. The ZT out performed ZS's and ZR's on the bends, a great tribute to this larger of the "Z" cars. Only car to overtake me............ a Lotus Exige, well happy.