I have fried 3 servos on the vekta and most of the wiring. The front on these car are just too heavy specially with big bore and all the aluminum upgrades. I have watched the voltage drop under 5v while running the car and also the heat from the motor and pull start doesn't help at all for the steering servo. Try running a 4s lipo with a voltage regulator and see what happens or you can buy the big boy 1000 hitec servo.
For the exhaust movent go with a higher rate springs and change out the rubber isolator to a firmer one.
For the exhaust movent go with a higher rate springs and change out the rubber isolator to a firmer one.