Had an opportunity to run the Exotek soft chassis plate and extra flex top deck on my 417 and it was night and day difference between it and the stock chassis and upper deck.
I didn't cut the motor mount yet i wanted to try it without cutting it to see and the car is literally glued to the track. It was also very very easy on my tires i ran the same set all day (and they were already used!!) without issue i noticed no appreciable change. I rotated my tires after every run.
Not only that but i didn't get the rubbies on my chassis, i dunno why but in my old age i like a nice clean chassis =D hahaha.
I had some battery tape issue in the main so i'm looking at that screw down batter holder to fix that. I also wasn't running timing and boost and turbo weren't working on my motor guys were literally half a straight faster than me ... until we got to the infield
then it was like a shark eating tuna. Man i love this car!