I don't see where being a Cobra with IRS has any affect on the TT calculator, you are using a factory suspension even if it is from a later car. I'm getting dinged for a tubular k-member, and non OEM aero once I add the rear wing. Now if you are trying to run a TT letter class then yes you will get dinged, but I don't know if they are bringing those back next year, sounded like everyone will be in 1 of the 4 ST/TT classes.
I would need to pull up the previous conversations I have had with some of the local guys who went down the same path. If I recall, the IRS would force them to treat the car like a 99, and the body would get dinged for aero mods. And the fact its a cobra would get dinged as well because they base the mustang of the GT and I would get hit for engine points etc.
I dont 100% recall the specifics but at this point in time im not worried about the TT classes. I need to prove myself in the TA classes which plays off strictly power to weight ratios - no other points etc come into play. Once i do well in time attack, I will look into moving to TT. Fortunately and unfortunately we have a lot of fast guys. fortunately because competing with fast guys will force me to be faster but unfortunately because they are certainly hard to beat lol.
Sometime in late 2019 I will plan to revisit and actually sit down with someone who actually polices the rules and walk me through how the points work and what class I would actually be in.
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