eclipsed

So heres my dilemma. Do I Keep pouring money into my current car (having to have 99% of it all custom made due to lack of aftermarket parts) or just go ahead and get another car that has plenty of options readily available? I've already dumped about 10-15k into work in the (not counting the actual cost of the car which is paid off)

So my question is, finish the project, or sell it off and get something that already has aftermarket products readily available? What yall think?