As of Beta v22.214.171.124, SRS enhanced the engine rumble.
Now you can choose between "Original" and " Enhanced".
It is hard to explain, but we have optimized all the formulas and engine shakes based on the RPM range of the car to get a natural engine feeling. You really need to try to see what we mean.
If you do not like it, just set back to the original and you are using the previous version of the formula and sounds/shakes.