I've given this some thought as I've spent the last few hours on the classifieds. I think there's a certain stigma attached to modified cars that they'll have been thrashed or maybe not maintained properley. Now, whilst a performance car being thrashed wouldn't bother me, what would bother me is a sketchy service history.Personally, the biggest difficulty I can see with selling a modified car (or buying a modified car for that matter) is how to price it and sellers generally asking too much for them. Because a car may have cost you £10,000 and seen you spend another £10,000 on it, that doesn't mean it's a £20,000 or even £15,000 car. It is still a Clio/Fiesta/Vauxhall etc. etc., and has to be priced realistically to reflect the base car plus ''x amount'' that is reasonable to the work that's been carried out or the value of the parts added...
For example, a good friend of mine has just this week picked up an Evo VIII. It's running 450-500BHP depending on map (it has switchable mapping), it's got every toy and shiny thing you can think of from a twin scroll manifold, big monster eight pot brakes and all singing all dancing coilovers. The price it was advertised for? £10,995. The price he paid? £10,995. Upon speaking to the seller and getting a host of photos he was more than happy that despite being used as a track/weekend car, it had a well documented service history and had wanted for nothing in it's life. Every part was reciepted to a sum in excess of £20,000 (on top of the original cost of the car itself). He didn't even try and haggle, he jumped on the next train to go and get it and thrashed the sh!t out of it on the six hour drive home. Now, where am I going with this? Well standard Evo VIII's with the same full service history are going for £9,000-10,000. So basically he's got a car he could return to standard and sell for near enough what he paid for it and like Womble would be left with a stack of parts that in this case would be almost as much again even on the secondhand market!!! So really a modified car is worth what the market value of it's base model dictates, plus infinitum, it's a buyers market when it comes to modified cars. If you want it to sell to somebody who respects it for what it is then price it accordingly. If you're happy to wait a year for all manner of offers and phonecalls from dreamers and testpilots then price it at the standard cars value plus 50% again to claw back some of your hard earned and be prepared to put up with the people it'll attract. The ones who know what the car is will take one look at the price and think ''joker, it's still a Clio/Fiesta/Vauxhall etc..'' and they'll go buy a standard one and modify it themselves.
Just my take on things going off recent and personal experience down the years.
And for the record, this is how I value Nicole at the moment financially and sentimentally...
£8,500 (purchase price in 2010)
£7,500 (minimum cost of parts added)
£1,500 (rough cost of tax and servicing etc.)
£17,500 (very rough guesstimate of what she's cost me)
£4,500 (likely dealer P/X price at a specialist in current state)
£6,000 (optimistic value she'd fetch in a private sale if standard)
£7,500 (what she's valued for on my insurance with mods included)
£8,500 (the price she'd go in the classifieds for as she stands if my head was turned)
So really for me, in THE BEST CASE SCENARIO, I'll have lost ''only'' £9,000 and in the worse I'll have lost £13,500...