Thanks for the advise. When I say unique, I am referring to the look and conditions of the engine, for example I was recently bidding for the Porsche orange color Shelby of VMAN but someone came and hit the buy it now for $49k, so it was not for me, I don't pay 49k for a 10,300 miles engine...
link here Shelby : Backdraft Racing Cobra - Roush Edition in Shelby | eBay Motors
The car of StreetSnake is also a nice piece for me, I like the color and the motor
The "NEW" Backdraft #821
so for me unique would be a high performance tuned motor with a non traditional color and accessories. Is the orange backdraft on Ebay were below 5k miles, I will definitely pay 49k, but when you are talking of high performance engines you should always look into lower miles owners.