.Easier said than done in this case, I think. The car won't pass inspection without the factory ECU (in Texas at least). Plus, it's not clear what other systems might be inter-dependent. For example, the brake by wire, the differential, the ABS, all talk to the ECU. Here's an article that talks about all the problems even a pro race team had trying to deal with all the software and electrics issue when using non-factory systems in a Corvette:
Some of the things you talk about can be done on many models with the factory ECU. Plus, I the QV already allows you to turn driver aids like traction control off.
Sounds like it is best to buy an engine and say repower a GTV6 with it :surprise: