Modifications, good for resale?

[AMG Merc]

I had to grin when I read this (rather mundane) report - see item 6...

http://www.dailymail.co.uk/money/cars/article-2547...

6. Beware modifications!
Watch out in particular for modified exhausts, tyres or air filters. These are often carried out by enthusiasts rather than professionals, and can cause you problems later on.

[andygtt]

I always modify my tyres... usually with a sharp knife and tweezers

[Juno]

I've just modified my battery!

For one that starts my car. Lol

[AMG Merc]

Just saw this

http://fortyonesix.com/news/1843/prototype-testa-r...

Note the comment 'It is so valuable because it is totally unmolested and not restored, genuine and very original.'