I say exit straight after the big silencer under the car would save lots of bends getting the pipe to the rear of the car.
1.3 looks mean as fuck. That's my fav, then 1.1.
Even though they are slightly chav, the dual pipes do look good. As long as they aren't bright shiny chrome!
-phone-
there is not a 4 cylinder engined car in the world that could "pull off" quad tips...