It depends on your timeframe. The longer you can wait for the guy who wants all the mods to show up (and will pay a premium for them) the more it is worth it.

But if you have to make a fast sale, mods of any sort tend to devalue the vehicle because it raises questions in the buyer's mind about what else you might have tinkered with (and messed up) that you aren't fessing up to.

This applies to any car, not just VXs.