"Stock" is such a relative term. I've spent my money trying to make my interior more JDM, closer to the GT-86. "Stock" to me means that one doesn't know any better about what can be improved upon.
I was quick to remove the orange side markers since the car looks much cleaner without them. JDM comes with underbody aero panels. Also, if you got a lower trim model, having stock parts from an upper trim can be highly rewarding.
I guess it just depends on what you're going for. Most people want the car to be unique to them. I want my car to essentially be more show than go, but I would like it to be a capable autox car, which is why I'm even bothering with suspension bits.
My body fat absorbs most of the extra NVH from making the car stiffer anyways.
