I think the fact that a Nistune "looks factory" is an arbitrary point, I mean how many cops are really gonna make you pull off the kick panel and check out the ECU? And even if you have an aftermarket ECU, I'm sure there are bigger issues you'd be facing in terms of defects (turbo, FMIC, exhaust, suspension etc).
I got my PFC for $550 without the controller, which I didn't really need anyway.