No contest.
Here is a real life example ...
2011 NASA CMC series, we had the S197 as a CMC option platform. Same rules as other platforms, 260 rwhp, 275 width TOYO RA1 tire, 3200 ish weight limits. That year, not many regions had S197s so there was very little data. When the NASA Nationals came up in September, IIRC 2 S197 platforms showed up to a number of 4th gens, and Foxes (SNs included). The S197s just murdered the other CMC cars. Now I'm sure some was driver, but the Nationals don't just have weak drivers. Most that make that race are seasoned drivers at the top of their regions.
2012, everyone jumped the S197 platform and it got some stiff penalties for weight and tire width was limited to 235. 3400lbs is minimum weight. Mind you all other platforms are allowed 3100-3200 minimum. So the Nationals came up and a S197 won AGAIN, not the same driver, with a 3600lb pig. And, to add insult to injury, he drove the car there, won, and drove home!! The ***** was street legal!!
So 2013,the S197s are limited to 225hp/275tq. They are allowed a 275 tire from what I see in the rules. But an new class called Spec AI has been developed almost to get the S197 out of the CMC series. What's gonna happen this year at Nationals? We'll see, it's only a few weeks away.