A bit of help needed, Following a major re-build I'm trying to work out the Sprint classification for my car, it's either 'Road-going production' or 'Modified series production'. My queries are around the follow spec. Car is a 1995 Supersport. Engine: 1800cc K-series Dry-sump with 1 litre catch tank Multiple throttle bodies Emerald ECU Body Aero-screen half doors un-modified Chassis Standard S3 Wide track Roll bar FIA tall bar with petty strut. Tyres Either Toyo 888's or Yoko AVAN A048 R On the latter I'm a bit confused by the blue book where it makes reference to '...OE fitments marked LTS in sizes 195/50x16 & 225/45x17 only). Does this mean these tyres are generally permitted unless in these sizes when they must also have 'LTS' marked on them? I’m thinking the car will be 'Modified series production’, as it has a modified induction but I can’t find reference to ECU. is the ECU spec free? Advice much appreciated Tim