Thank's for the reply Chuck. That is what I thought, but herd some yes some no. Don't want to chop the car up to go 10s, there is a bolt in bar on the site for sale and thought it wouldn't be to invasive just drill some holes which could be welded at a future time if you no longer wanted the bar. Guess I'm back to slowing the GN down to 11.50s, and proceeding with the tubbed S10 project. I don't mind doing whatever is necessary on that. And yes a rule book is in order