300ZX @ 245hp...
I'd say with a proper SIR to limit the output to 245hp, some adders for the additional torque of the bigger V6 and the excellent brakes (not that they would make much of a difference at this weight...)...
3250lbs or so for ITS... I could see that working... The torque makes me nervous, but otherwise, I think it would work...
As for the rest of this... You guys need to all get a grip...
We've made some of the BIGGEST updates/changes to the IT Infrastructure in the past two years than have EVER been made since it's inception...
We've fixed rules, made additional allowances, completely altered the way cars are classified (for the better, I might add...)... put cars in the CORRECT classes at reasonable weights... and have fixed MANY of the issues that people were having with the IT classes....
NOW, I hear talk of IT "needing" to embrace 18" wheels or Turbos or AWD, etc...
Sounds a lot like working off of people's fear to me...
Look, let's get real here... The SCCA over the course of a SINGLE season, has already implemented a National level T3/4 program... They didn't do it for something that "would" be needed 10 years down the line... they had a need today, and they did it...
The point being that if, and when there is a need, there is usually a solution not far behind...
While it may seem like it would be cool and trendy, etc., for IT to open things up... there is a basic class here that has always WORKED, JUST THE WAY IT IS... We've worked VERY hard to try to preserve that, while still making updates that would bolster the class, WITHOUT killing it's concept...
In fact, many of the adjustments we've proposed, and that the CRB is hopefully going to approve this next week, will correct some things that were seen by some as "killing" the competitiveness of certain classes... Let's call it getting rid of the "car of the month" club...
I'm the first person to stand up and say that the SCCA NEEDS... MUST HAVE... a "World Challenge" style class in it's structure to accomodate the new trends... I envision it as something that might use rules similiar to the WC rules of the late 90's or early 2000/2001 or so... A little more than IT prep on the motors, Limited prep on the suspensions... spec sized brake packages, wings, Plus sized wheels, wider widths, stock trannies, and maybe even wings... IT on steroids, if you will...
I DON'T, however, think that we need to start talking about making IT this class... NOT any more than I think that it should be called "D-Production", etc... It's NOT IT, and it's NOT Production... It's entirely new...
And, in fact (much more a "fact" than some of the claims I'm reading here...), this class is in the works by a focus committee, or at least was the last I heard... which was about a month ago...
THIS is the place where many of these cars are going to end up... I'm guessing that even the ITS E36 would prefer to be in a class like this, what with all the Turner stuff available and all the money these guys like to spend...
The bottom line is that IT as a structure WORKS... JUST AS IT IS... We have more excitement about this class now than it's seen in 20 years... (and yes, I was around then... barely...

) We have cars classed that are as recent as 2000, and more on the way... Overall, this is a very exciting time to be in IT...
So, think really hard about some of these speculations you are making here... We can all envision what "might" happen if we implement this or that, but history has a funny way of showing us what will happen in the future, and like ITGT turning into AS... so would likely be the way of ITR and "Club Challenge"... etc...
At some point, the "potential" for some of these cars will exceed their equipment, and you'll have to make a decision as to whether or not to allow things that would otherwise be considered very un-IT-Like... That's the point where you no longer are maintaining the "spirit" of the IT philosophy, and that is the point where you should realize that a new direction... a new class structure, might be in order...
If I wasn't so busy working with IT, I'd volunteer to take over the Club Challenge/D-Prod class implementation task myself, because no one wants to see that happen, and happen CORRECTLY, more than me...