R200 rear end should be able to handle to about 600 hp. You're nowhere close to start blowing these diffs yet. Even then, its not the diff that will be the issue, its usually the axles input shaft into the splines that like to twist like pretzels.
If you already got an S14 subframe, reinforce it. Also, dont forget to get an S14 diff cover since the S13 one wont work.
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