This is still a perceptual difference. The chassis "code" is exactly the same for all cars in the game. That's how vehicle systems for games is done.
Grip, rigidity, weight, weight distribution, wheelbase/track. The swap itself adds the ability for downforce but if you want to build a good 500-550 car, you'll want the downforce set to 0. Does it have extra grip? Yes, but only maybe 5% more based on what I've found so far, so you need to decide whether you want to decrease grip to increase HP or leave it and deal with the HP deficit.
Peugeot 908+Challenger
1115kg. No downforce. Stock motor. 550pp
So, my point is that ANY chassis swap is not legit in reality. If you swap a unit body chassis from one car to the next, you're changing the car. However, can I get a challenger to be 1115kg with 50/50 weight? I think so.
This is Eric Bana's Ford Falcon. It's all the things that are supposedly not "legit" when it comes to a race car chassis swaps in GT5.
Anyway, it's all opinion. I don't worry so much about the real world legitimacy of any swap. I just want it to look clean and work properly.
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