My S13 SR does the same thing. Its its the turbo's seals going out. It took me a while to figure out because the smoke is white but it doesn't smell sweet like coolant. It actually has more of an oil smell to it. The mystery smoke freaked me out, but its just the turbo. Used ones can be had for $100, while a rebuild is like $300.
BTW, i had the wastegate signal line from the boost solenoid fail because it hardened from heat and cracked. Save yourself the trouble and use a silicone line, and then cover it with heat wrap. BTW, theres no "blow-off" on my car.
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