There is. You can make a part of your car worse to make up for a deficiency. For instance, let's say you have a car that runs on rails but has no horsepower. Reduce the grip modifier so it's corner speeds drop but it's PP drop as well.
Everyone fails to grasp that this is all virtual. There are no "aluminum blocks" or "race suspensions". Everything is just number ranges. Each car is a collection of range limitations. When you throw a "race suspension"on something, all you are really doing is changing the range of values.
The dreaded grip multiplier isn't a cheat, it's the basic element of the game. cars are set to +/- 100 grip. Rain, snow, tires, tire wear, all these things change that base value. Sure, set the value to 110 and lose 100hp, and you car will drive like crap.
The best cars in the game, cars like the 111R, LFA, CSL, NSX variants, are the cars that are the closest to a perfect balance of numbers.
It's time to stop calling it cheating. It's just advanced tuning. Some values are still locked away (suspiciously enough) so that modding within a target PP isn't out of control. Can there be some cars that are outliers? of course. The game already has outlier cars. So why aren't people always driving the best car at any PP range? Why aren't we all driving LFA's? Because everyone loves the fantasy of tuning a particular car, and even with these new tools, there are limitations with each car that makes it fun.