Nah.... Your car mate you do with it as you see fit.
I went on a pretty impressive run last Sunday with the Ferrari and Lamborghini Clubs to Patonga Beach.
There was literally millions on dollars worth of cars gathered and as my 328 is currently getting a major service, I took the JDM R32.
I had quite a few of these guys all over my car complimenting how original it was. Most of them had never seen one with an original exhaust or radio cassette player.
Anyway, each to their own, the only thing that matters is that you are happy with it. Just make sure you keep all the original bits safely stored.
Here are some pics...... Enjoy.
Bob.