I'm not gonna touch the tire issue. LONG story, lots of participants!
It's not the $$$$$$$ to be thrown at an RX-7, It's the driver. Put simply, there is not one owner who is currenty capable of driving an RX-7 into the 11's. There are plenty of cars with the ability to go 11's and some perhaps 10's. Maybe it's easier with an automatic trans, huh John Force Jr.???
I have not put a dime into go fast goodies to affect the performance of my vehicle since the winter. I ran 13's in the Spring, 12.8 two months ago, and 12.5 yesterday all with street tires, on 18 inch rims. ALL ON STOCK TWIN TURBOS! I'm basically learning to drive!
I'll be getting closer to 11's, and with practice and good luck into the 11's, when I learn to launch with ET Streets.
til then, Fawk off! graemlins/thumb.gif