RE: Here are my numbers....
13.6 is very good. I need to take my stang to a 1/4 mile track. Here in San Diego area, we only have 1/8 mile tracks. My 1/8 mile times at Barona are in the low 9s. My best run is 8.8, but the Density Altitude at Barona is usually around 4000', so a 9.2 is actually a 8.87 and a 8.8 is actually about a 8.4. But I do have an intake/tune and LCA, so that help a bit.
This weekend I plan on taking my car to Qualcomm Stadium. They have an 1/8 mile track there. It's a decent parking lot but a crappy track. I hope to see some Challengers there. Mustangs that run street tires there normally run mid to low 9s, I assume Challengers would run the same.