their illegal because the 240sx wasn't crash tested with them. i don't know anything about harnesses as for hold you in better or not, but they don't want you to have them in case you wreck your car and you have to get out due to a gas leak and you're sitting there unbuckling 5 things. also if you cleverly drive your car into a lake, you will be able to get out easier with stock belts. i think those are the reasons.
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02 Blazer X - 90 240SX w/SR
oh noes
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