weld or not weld diff!!!????

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Recently completed my first track day in silvia (car just for track so not going on road) and it's the first RWD car ive driven without an LSD. And to be frank found it annoying coming out of bends and lighting the inside wheel up. Tried all manor of different driving techniques to eliminate but still losing traction exiting bends.
Have not got the time/cash or patience to do an LSD conversion so spoke to mate of mine who has vast motorsport experience and he said would give excellent drive out of fast bends but would create understeer in hairpins and slower tigter bends.
Having not driven a car with a fixed diff was after some advise from someone that has or done this on a silvia.Don't what to ruin car as apart from this the car performed brilliantly.

Inaddition i can arc weld but where about on diff to weld up and can this be done without removing the diff?

Many thanks
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