I made an engine swap for the 6.2 V8 on my Chevy Monte Carlo SS, and it sounds nowhere near an actual LS engine. I guess the sound should be at least similar to the Camaro/Corvette in-game, given the fact that the engine came from one of those cars. The sound is much more muffled than the original V8 that came with the Monte Carlo. I didn’t make any other upgrade to the car besides the engine swap, so intake and exhaust are all “stock” (for that engine). I didn’t bother to check the other swaps and evaluate the sound of them. I play on Xbox Series X.