The custom work on any LSx swap will be pretty intense (mounts, trans upgrade as well?, dash/ecu/gauges all custom from scratch, etc). For a dedicated track car with a destroyed VQ that needs replacing, I could see doing it if you had the money and time. The big unknown additional cost is whether you'd need to replace the ABS controller as well (with a one-off race unit or something cheaper that's compatible with the LSx ECU?). Something tells me the stock ABS unit might have issues running on its own without the expected inputs from the Nissan ECU? A couple of people have linked custom race-oriented standalone ABS controllers that would work, but they were all in the $7,500++.
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