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You really don't need a 2 way unless your throttle inputs are crazy as hell and you are on/off the throttle through corners spiratically. A 1.5 (or even a 1 way) is fine for road racing and getting good times. The reason I ran a locker is it was loose surface racing and sliding and crazy throttle inputs were the name of the game. Tarmac you shouldn't leap off the throttle suddenly in a 2 even with a 2way, it will just not do nice things for you unless you are hauling up under brakes, the 2 requires a different style of driving than your standard setup.
It also takes quite a bit of horsepower to effectively use an LSD anyway, if I put one in my n/a 4age racecar I would be hard pressed to make a difference that I couldn't using suspension setup and if I put the money from getting an LSD into suspension and slicks I would go a lot quicker. I can see a 2 way making it harder to pinch one rear under brakes but otherwise I seriously don't think its needed. It will help launching but you don't need a 2 way for that plus good tyres would also make up that difference.
At the moment I am near the top of my class in my 3sge mkI and it runs an open diff on gravel and I am still turning out awesome times and I'm not unhappy with how it handles trailing off the throttle or on it.
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