Hi all ,I been looking online for some time to see if some one has tried 3.9 or 4.11 diff gears for their alloytec berlina or omega 4speed auto, but I haven’t had any luck , so if anyone has first hand experience your feed back will be appreciated I have tested all my mods down the 1/4 mile and so far this is what I got. Ozztrack tune only 16.27 + mace 12mm spacers and k&n air filter 16 flat. + rear sport muffler only 15.86 Had a small tune change ,use to shif at 6000 rpm 1st 70kph 2nd 140kph now 1st 80kph 2nd 160kph @ 6600rpm but waiting on cooler whether to test down the 1/4. I think the car can run a low 15s now but it’s just a theory base on how the car feels With the new tune. My goal its to get into the 14s I think 4.11s will do the trick .