I have a 2006. The differences are cosmetic. A 06 is rarer and a year newer. I'd like to think a 06 SRT-6 is worth more than an 05 but were talking about 9 and 10 year old cars. It takes a special buyer to believe in the investment to pay for rarity. Especially an essentially unknown car. If I was looking for another SRT-6 I wouldn't pay more based on year.

Les