On a more helpful note. In order to achieve your goal, you might initially do some research on the IRS z cars traction limits with a daily street tire /and supporting improvements. My opinion is your going to need at least a 1.90 60ft and some serious power (500ish rw) to do an 11.0 ET. The extra power at these times don't do much good without traction. Side note: If you decide to try a racing tire, the majority of street cars with stock suspension I've seen gain a strong 2 tens off their 60ft with a drag radial of similar size.