Your market here, money aside, is anyone who didn't buy an SRT due to the Automatic. That would include me. However, the other aspect of this is of course cost. And I'm not talking final cost, I'm talking initial cost. If I could finance a V8 Crossfire and pay for it over 4 years, sure I'd be on top of it.. but getting private financing can be a hard prospect, especially for a car that the bank would value well, well under the actual sale price..

Having all the options, though, is the way you want to go... V8 kits, any upgrades for the already existing SRTs and N/As, full turn key V8's...

Hell, I hope you're the next Carroll Shelby.. I'll be in line as your first part time employee to get the word out and do some wicked marketing, shouting from the roof tops!

Now is this all economically viable and a self sustaining business with the already niche Crossfire market? Maybe not. But I do think you've got some great potential, especially if you apply the knowledge you have to other Mercedes.