Turbos use the exhaust to spin a turbine to suck in more fresh air into your engine. If exhaust fumes are leaking into the cabin, that’s a risk of carbon monoxide poisoning. Also a cracked turbo could end up sending metal bits into your engine and then you’d need a whole new engine instead of just a turbo. I’d get it fixed now.
Turbos use the exhaust to spin a turbine to suck in more fresh air into your engine. If exhaust fumes are leaking into the cabin, that’s a risk of carbon monoxide poisoning. Also a cracked turbo could end up sending metal bits into your engine and then you’d need a whole new engine instead of just a turbo. I’d get it fixed now.