>> So what are the odds of getting the TPI 350 approved? its only 10 or 15 more horse...

I don't speak for the ITAC in this regard but the chance right now would be something approaching zero. Someone had to burn up a lot of political capital to get the options you saw listed through the system.

And there's a law of diminishing returns that kicks in pretty hard for every addition stock HP that gets added, to what is already perceived as a pretty heavy car. At some point, it's just not practical or attractive to put lead in a more powerful car to compete in any given class.

K