Yup most definitely, does not make such big difference with 0 - 100 times, as you are changing gear one extra time, but in terms of going to higher speed it makes a difference, or at least that is what the butt dyno tells me :grin: The biggest difference is the acceleration while staying the the same gear, feels really strong.
One thing I should say it I would be good idea to do this along with a 6 speed box upgrade, else your cruising RPM will be too high, but that is just my opinion.
And I would say that 3.46 would be too short, if the car is daily.
One other thing I have noticed is I can now hear my car's overrun in 2nd and a little bit in 3rd as well :rollsmile: (Note this is still the stock exhaust with all the cats :grin: )