I have a 99 m roadster and my best luck has been launching at about 2700. As far as tires go, i have 255/40/17 in the front on stock wheels and no spacers and 275/40/17 on the stock rear wheels also with no spacers, although with the stock 9" rear wheel, you can go to as high as 285's with any modification. I have been using sumitomo htrz2's for about 2 years and i love them, not too sticky, not too hard, and a great price.
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