Selling my 35th ann ed.gt vert w/17,000 miles on it.Could not afford the cobra at the time so got the g.t. Love the idea of the i.r.s.and the high revving engine.Will there be much difference in the performance between the two say stock for stock? What are the negatives if any for the 1999,if it has the"fix' it should wax my gt vert.All you 99'ers LET ME KNOW,THANKS!!